Infusion medium delivery system, device and method with needle inserter and needle inserter device and method

ABSTRACT

An infusion medium delivery system, device and method for delivering an infusion medium to a patient-user, includes a needle inserter device and method for inserting a needle and/or cannula into a patient-user to convey the infusion medium to the patient-user. The needle inserter device and method operate to insert a needle and cannula into a patient-user&#39;s skin and automatically withdraw the needle from the patient-user, leaving the cannula in place and in fluid flow communication with a reservoir. The delivery device may include a base portion and a durable portion connectable to the base portion, and wherein the base portion can be separated from the durable portion and disposed of after one or more specified number of uses. The base portion supports the reservoir and the needle inserter device, while the durable portion supports a drive device for selectively driving the infusion medium out of the reservoir and into the needle and/or cannula.

CROSS-REFERENCE TO RELATED PATENT APPLICATIONS

The present invention relates to U.S. Provisional Patent Application60/839,840, filed Aug. 23, 2006 (attorney docket no. 0384) and U.S.Provisional Patent Application 60/854,829, filed Oct. 27, 2006 (attorneydocket no. 0401), each of which is incorporated herein in its entiretyand forms a basis for a claim of priority. The present invention alsorelates to U.S. Patent Application 60/678,290, filed May 6, 2005 andU.S. patent application Ser. No. 11/211,095, filed Aug. 23, 2005, titled“Infusion Device And Method With Disposable Portion,” each of which isincorporated herein by reference in its entirety. The present inventionfurther relates to co-pending application No. 60/839,822, filed Aug. 23,2006, entitled “Infusion Medium Delivery Device And Method For DrivingPlunger In Reservoir” (attorney docket no. 047711-0382); co-pendingapplication No. 60/839,832, filed Aug. 23, 2006, titled “Infusion MediumDelivery Device And Method With Compressible Or Curved Reservoir OrConduit” (attorney docket no. 047711.0383); co-pending application No.60/839,741, filed Aug. 23, 2006, titled “Infusion Pumps And Methods AndDelivery Devices And Methods With Same” (attorney docket no.047711.0385); and co-pending application No. 60/839,821, filed Aug. 23,2006, titled “Systems And Methods Allowing For Reservoir Filling AndInfusion Medium Delivery” (attorney docket no. 047711.0381), thecontents of each of which is incorporated herein by reference, in itsentirety. Embodiments of the present invention also relate to: (i) U.S.patent application Ser. No. 11/588,832, filed Oct. 27, 2006, entitled“Infusion Medium Delivery Device and Method with Drive Device forDriving Plunger in Reservoir” (attorney docket no. 047711.0387); (ii)U.S. patent application Ser. No. 11/588,847, filed Oct. 27, 2006,entitled “Infusion Medium Delivery Device and Method with Compressibleor Curved Reservoir or Conduit” (attorney docket no. 047711.0390); (iii)U.S. patent application Ser. No. 11/588,875, filed Oct. 27, 2006,entitled “Systems And Methods Allowing For Reservoir Filling AndInfusion Medium Delivery” (attorney docket no. 047711.0393); and (iv)U.S. patent application Ser. No. 11/589,323, filed Aug. 23, 2006,entitled “Infusion Pumps and Methods and Delivery Devices and Methodswith Same” (attorney docket no. 047711.0398); (v) U.S. PatentApplication No. Unassigned, filed Nov. 20, 2006, entitled “Systems andMethods Allowing for Reservoir filling and Infusion Medium Delivery”(attorney docket no. 047711.0397); (vi) U.S. Patent Application No.Unassigned, filed Nov. 20, 2006, entitled “Systems and Methods Allowingfor Reservoir filling and Infusion Medium Delivery” (attorney docket no.047711.0396); (vii) U.S. Patent Application No. Unassigned, filed Nov.20, 2006, entitled “Systems and Methods Allowing for Reservoir fillingand Infusion Medium Delivery” (attorney docket no. 047711.0395); (viii)U.S. Patent Application No. Unassigned, filed Nov. 20, 2006, entitled“Systems and Methods Allowing for Reservoir filling and Infusion MediumDelivery” (attorney docket no. 047711.0394); (ix) U.S. PatentApplication No. Unassigned, filed Nov. 22, 2006, entitled “InfusionMedium Delivery Device and Method and Drive Device for Driving Plungerin Reservoir” (attorney docket no. 047711.0389); (x) U.S. PatentApplication No. Unassigned, filed Nov. 22, 2006, entitled “InfusionMedium Delivery Device and Method and Drive Device for Driving Plungerin Reservoir” (attorney docket no. 047711.0388), the contents of each ofwhich are incorporated by reference herein, in their entirety.

FIELD OF THE INVENTION

Embodiments of the present invention relate to an infusion mediumdelivery system, device and method for delivering an infusion medium toa patient-user, including a needle inserter device and method forinserting a needle and/or cannula into a patient-user for conveying theinfusion medium to the patient-user. Further embodiments relate to theneedle inserter device and method, whether or not included in aninfusion medium delivery system, device or method. According to someembodiments as described herein, the delivery device may include adisposable portion and a durable portion connectable to the disposableportion, and wherein the base portion can be separated from the durableportion and disposed of after one or more specified number of uses. Thedisposable portion supports a reservoir, while the durable portionsupports a drive device for selectively driving the infusion medium outof the reservoir and into the needle and/or cannula.

BACKGROUND OF THE INVENTION

Certain chronic diseases may be treated, according to modern medicaltechniques, by delivering a medication or other substance to apatient-user's body, either in a continuous manner or at particulartimes or time intervals within an overall time period. For example,diabetes is a chronic disease that is commonly treated by deliveringdefined amounts of insulin to the patient-user at appropriate times.Some common modes of providing an insulin therapy to a patient-userinclude delivery of insulin through manually operated syringes andinsulin pens. Other modern systems employ programmable pumps to delivercontrolled amounts of insulin to a patient-user.

Pump type delivery devices have been configured in external devices(that connect to a patient-user) or implantable devices (to be implantedinside of a patient-user's body). External pump type delivery devicesinclude devices designed for use in a generally stationary location (forexample, in a hospital or clinic), and further devices configured forambulatory or portable use (to be carried by a patient-user). Examplesof some external pump type delivery devices are described in U.S. PatentApplication No. 11/211,095, filed Aug. 23, 2005, titled “Infusion DeviceAnd Method With Disposable Portion” and Published PCT Application WO01/70307 (PCT/US01/09139) titled “Exchangeable Electronic Cards ForInfusion Devices” (each of which is owned by the assignee of the presentinvention), Published PCT Application WO 04/030716 (PCT/US2003/028769)titled “Components And Methods For Patient Infusion Device,” PublishedPCT Application WO 04/030717 (PCT/US2003/029019) titled “DispenserComponents And Methods For Infusion Device,” U.S. Patent ApplicationPublication No. 2005/0065760 titled “Method For Advising PatientsConcerning Doses Of Insulin,” and U.S. Pat. No. 6,589,229 titled“Wearable Self-Contained Drug Infusion Device,” each of which isincorporated herein by reference in its entirety.

External pump type delivery devices may be connected in fluid-flowcommunication to a patient-user, for example, through a suitable hollowtubing. The hollow tubing may be connected to a hollow needle that isdesigned to pierce the patient-user's skin and deliver an infusionmedium to the patient-user. Alternatively, the hollow tubing may beconnected directly to the patient-user as or through a cannula or set ofmicro-needles.

In contexts in which the hollow tubing is connected to the patient-userthrough a hollow needle that pierces the patient-user's skin, a manualinsertion of the needle into the patient-user can be somewhat traumaticto the patient-user. Accordingly, insertion mechanisms have been made toassist the insertion of a needle into the patient-user, whereby a needleis forced by a spring to quickly move from a retracted position into anextended position. Examples of insertion mechanisms that are built intoa delivery device are described in U.S. patent application Ser. No.11/211,095, filed Aug. 23, 2005, titled “Infusion Device And Method WithDisposable Portion” (assigned to the assignee of the present invention),which is incorporated herein by reference in its entirety. Otherexamples of insertion tools are described in U.S. Patent ApplicationPublication No. 2002/0022855, titled “Insertion Device For An InsertionSet And Method Of Using The Same” (assigned to the assignee of thepresent invention), which is incorporated herein by reference in itsentirety. Other examples of needle/cannula insertion tools that may beused (or modified for use) to insert a needle and/or cannula, aredescribed in, for example U.S. patent application Ser. No. 10/389,132filed Mar. 14, 2003, and entitled “Auto Insertion Device For SilhouetteOr Similar Products,” and/or U.S. patent application Ser. No. 10/314,653filed Dec. 9, 2002, and entitled “Insertion Device For Insertion Set andMethod of Using the Same,” both of which are incorporated herein byreference in their entirety. As the needle is moved into the extendedposition, the needle is quickly forced through the patient-user's skinin a single, relatively abrupt motion that can be less traumatic tocertain patient-users as compared to a slower, manual insertion of aneedle. While a quick thrust of the needle into the patient-user's skinmay be less traumatic to some patient's than a manual insertion, it isbelieved that, in some contexts, some patients may feel less trauma ifthe needle is moved a very slow, steady pace.

As compared to syringes and insulin pens, pump type delivery devices canbe significantly more convenient to a patient-user, in that accuratedoses of insulin may be calculated and delivered automatically to apatient-user at any time during the day or night. Furthermore, when usedin conjunction with glucose sensors or monitors, insulin pumps may beautomatically controlled to provide appropriate doses of infusion mediumat appropriate times of need, based on sensed or monitored levels ofblood glucose.

Pump type delivery devices have become an important aspect of modemmedical treatments of various types of medical conditions, such asdiabetes. As pump technologies improve and doctors and patient-usersbecome more familiar with such devices, the popularity of externalmedical infusion pump treatment increases and is expected to increasesubstantially over the next decade.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a generalized diagram of a delivery system in relation to ahuman patient-user.

FIG. 2 is a perspective view of a delivery device according to anembodiment of the invention.

FIG. 3 is a perspective view of a durable portion and a disposableportion of the delivery device of FIG. 2, with the durable portionseparated from the disposable portion.

FIG. 4 is a schematic, cross-sectional view of a needle inserter devicewithin the delivery device of FIGS. 2 and 3, according to an embodimentof the invention, wherein a needle and a cannula are each in a retractedposition.

FIG. 5 is a schematic, cross-sectional view of the needle inserterdevice of FIG. 4, wherein the needle and cannula are each in a partiallyextended position.

FIG. 6 is a schematic, cross-sectional view of the needle inserterdevice of FIG. 4, wherein the cannula is in a fully extended positionand the needle is in a retracted position.

FIG. 7 a schematic, cross-sectional view of a needle inserter devicewithin the delivery device of FIGS. 2 and 3, according to anotherembodiment of the invention, wherein a needle and a cannula are each ina retracted position.

FIG. 8 is a schematic, cross-sectional view of the needle inserterdevice of FIG. 7, wherein the cannula is in a fully extended positionand the needle is in a retracted position.

FIG. 9 a schematic, cross-sectional view of a needle inserter devicewithin the delivery device of FIGS. 2 and 3, according to anotherembodiment of the invention, wherein a needle and a cannula are each ina retracted position.

FIG. 10 is a schematic, cross-sectional view of the needle inserterdevice of FIG. 9, wherein the needle and cannula are each in an extendedposition.

FIG. 11 is a perspective view of a needle inserter device according toanother embodiment of the invention, wherein a needle and a cannula areeach in a retracted and ready-to-be activated position.

FIG. 12 is a side view of the needle inserter device embodiment of FIG.11, wherein the cannula is in an extended position and the needle is ina retracted position.

FIG. 13 is a perspective view of the needle inserter embodiment of FIG.12.

FIG. 14 a schematic, cross-sectional view of a needle inserter devicewithin the delivery device of FIGS. 2 and 3, according to anotherembodiment of the invention, wherein a needle and a cannula are each ina retracted position.

FIG. 15 is a schematic, cross-sectional view of the needle inserterdevice of FIG. 14, wherein the needle and cannula are each in apartially extended position.

FIG. 16 is a schematic, cross-sectional view of the needle inserterdevice of FIG. 14, wherein the cannula is in a fully extended positionand the needle is in a retracted position.

FIG. 17 is a side-perspective view of a portion of a delivery devicehaving a needle inserter device according to a further embodiment of thepresent invention.

FIG. 18 is a schematic cross section view of a cannula and cannula nestcomponent for use with the embodiment of FIG. 17.

FIG. 19 is a schematic cross-section view of an external needle injectorhaving a cannula and cannula nest of FIG. 18 aligned for operation witha delivery device having a needle inserter of FIG. 17.

FIGS. 20-23, each show a side view of a needle inserter device accordingto a further embodiment, in various positions.

FIGS. 24 and 25 show a perspective view of a needle inserter deviceaccording to a further embodiment, in a retracted or start position andin an extended position, respectively.

FIGS. 26 and 27 show a perspective view of a needle inserter deviceaccording to a further embodiment, in a retracted or start position andin an extended position, respectively.

FIGS. 28 and 30 each show a perspective view of a needle inserter deviceaccording to a further embodiment, in various positions.

FIGS. 29 and 31 each show a cross-sectional view of the needle inserterdevice according to FIGS. 28 and 30, respectively.

FIG. 32 shows a schematic side view of an arrangement of a durablehousing portion and disposable housing portion of a delivery systemaccording to an embodiment of the invention consistent with theembodiment of FIG. 3.

FIG. 33 shows a schematic side view of an arrangement of a durablehousing portion and a disposable housing portion of a delivery systemaccording to another embodiment of the invention.

FIG. 34 shows a schematic top view of an arrangement of a durablehousing portion and a disposable housing portion of a delivery systemaccording to an embodiment of the invention.

FIG. 35 shows a schematic top view of an arrangement of a durablehousing portion and a disposable housing portion of a delivery systemaccording to another embodiment of the invention.

FIGS. 36 and 37 show a perspective view of a connection arrangement fora disposable housing portion and an injection site module.

FIGS. 38 and 39 show a perspective view of another connectionarrangement for a disposable housing portion and an injection sitemodule.

FIGS. 40 and 41 show a perspective view of yet another connectionarrangement for a disposable housing portion and an injection sitemodule.

FIG. 42 is a cross-section view of a hollow needle and hydrophobic stopmember for priming a hollow needle or cannula of a needle injectordevice, according to an embodiment of the invention.

FIG. 43 is a side, schematic view of a hollow needle in a needle sethaving a hydrophobic material for priming.

DETAILED DESCRIPTION

The present invention relates, generally, to needle inserter devices andmethods and delivery systems, devices and methods that include suchneedle inserter devices and methods, for delivering an infusion mediumto a recipient, such as a medical patient. The needle inserter deviceand method may operate to insert a hollow needle or cannula through apatient-user's skin, to provide a fluid flow path for conveying aninfusion medium through the hollow needle or cannula and into thepatient-user. Embodiments of the present invention may be configured, asdescribed herein, to provide a reliable, cost effective and easy-to-usemechanism for inserting a hollow needle or cannula to a specific depthinto a patient-user with minimal traumatic effect.

In addition, embodiments may be configured to establish a contiguousfluid-flow passage for fluid transfer between a reservoir and thepatient-user, when the hollow needle or cannula is inserted into thepatient-user. Needle inserter devices according to embodiments of thepresent invention may be incorporated in a delivery device and share aportion of the delivery device housing with other components of thedelivery device. In other embodiments, needle inserter devices andmethods described herein may be employed in housing structures locatedexternal to a delivery device and connected to the delivery device, forexample, through a fluid-flow conduit.

In particular embodiments, a delivery device includes first and secondhousing portions (referred to herein as a durable housing portion and adisposable housing portion, respectively) that are configured to engageand attach to each other for operation. The disposable housing portionmay contain or otherwise support a needle inserter device, an infusionmedium reservoir and other components that come into contact with theinfusion medium and/or the patient-user during operation.

The disposable housing portion may be disengaged and separated from thedurable housing portion, such that the disposable housing portion may bereadily disposed of after it has been in use for a period of time, orafter one or a prescribed number of uses. After disengagement andseparation from a disposable housing portion, the durable housingportion may be engaged and operatively connected to another disposablehousing portion (such as a new, user-filled, pre-filled, refurbished,refilled or re-manufactured disposable housing portion) for furtheroperation. The durable housing portion may contain or otherwise supportcomponents that do not come into contact with the infusion medium or thepatient-user during normal operation of the delivery device, including,but not limited to, a drive device, drive linkage, electronic circuitsand, in some embodiments, a power source.

While embodiments of the present invention are described herein withreference to an insulin delivery example for treating diabetes, otherembodiments of the invention may be employed for delivering otherinfusion media to a patient-user for other purposes. For example,further embodiments of the invention may be employed for deliveringother types of drugs to treat diseases or medical conditions other thandiabetes, including, but not limited to drugs for treating pain orcertain types of cancers, pulmonary disorders or HIV. Furtherembodiments may be employed for delivering media other than drugs,including, but not limited to, nutritional media including nutritionalsupplements, dyes or other tracing media, saline or other hydrationmedia, or the like. Also, while embodiments of the present invention aredescribed herein for delivering or infusing an infusion medium to apatient-user, other embodiments may be configured to draw a medium froma patient-user.

Furthermore, while embodiments of the present invention refer to thehousing portions of disclosed delivery devices as disposable or durable,and may be configured to allow the disposable housing portion to bedisposed of and replaced in an economically efficient manner, it will beunderstood that, in further embodiments, the disposable housing portionembodiments described herein may be re-used and need not be disposed of.Similarly, the durable housing portion embodiments described herein maybe disposed of after one or more uses, if desired. However, embodimentsare configured to allow certain components (for example, those thatcontact the infusion medium or the patient-user during operation) to behoused in a first housing portion that may be readily disposable, whileother components (for example, those that do not contact the infusionmedium or the patient-user during operation and that have a replacementcost that is of a relatively significant level) may be housed in asecond housing portion that may be re-used with one or more new,user-filled, prefilled, refilled, refurbished or remanufactureddisposable first housing portions. Also, while delivery deviceembodiments of the present invention include multiple housing portions,such as a disposable housing portion and a durable housing portion,other delivery device embodiments may employ a single housing structurethat includes, among other features, a needle inserter device asdescribed below. Yet other embodiments may employ an injection sitemodule that contains a needle injector device and that connects to afurther housing (such as the disposable housing portion) of a deliverydevice, as described below.

A generalized representation of an infusion medium delivery system 10 isshown in FIG. 1, wherein the system includes a delivery device 12configured according to an embodiment of the invention described herein.The system 10 may also include other components coupled forcommunication with the delivery device 12, including, but not limitedto, a sensor or monitor 14, a command control device (CCD) 16 and acomputer 18. Each of the CCD 16, the computer 18, the sensor or monitor14 and the delivery device 12 may include receiver or transceiverelectronics that allow communication with other components of thesystem. While the sensor or monitor 14 in FIG. 1 is shown as a separateelement relative to the delivery device 12 and connected thereto througha communication link, in other embodiments, the sensor or monitor 14 maybe incorporated within the delivery device 12. The delivery device 12may include electronics and software for analyzing sensor data and fordelivering an infusion medium according to sensed data and/orpre-programmed delivery routines. Some of the processing, deliveryroutine storage and control functions may be carried out by the CCD 16and/or the computer 18, to allow the delivery device 12 to be made withmore simplified electronics. However, in other embodiments, the system10 may include delivery device 12 that operates without any one or moreof the other components of the system 10 shown in FIG. 1. Examples ofthe types of communications and/or control capabilities, as well asdevice feature sets and/or program options may be found in U.S. patentapplication Ser. No. 10/445,477 filed May 27, 2003, and entitled“External Infusion Device with Remote Programming, Bolus Estimatorand/or Vibration Alarm Capabilities,” and U.S. patent application Ser.No. 10/429,385 filed May 5, 2003, and entitled “Handheld Personal DataAssistant (PDA) with a Medical Device and Method of Using the Same,”U.S. patent application Ser. No. 09/813,660 filed Mar. 21, 2001, andentitled “Control Tabs For Infusion Devices And Methods Of Using TheSame,” all of which are incorporated herein by reference in theirentirety.

In the generalized system diagram of FIG. 1, the delivery device 12 andsensor or monitor 14 are secured to a patient-user 1. The locations atwhich those components are secured to the patient-user 1 in FIG. 1 areprovided only as a representative, non-limiting example. The deliverydevice 12 and sensor or monitor 14 may be secured at other locations onthe patient-user 1 (including, but not limited to, other locations onthe patient-user's skin, clothing, belt, suspenders, straps, purse orother carriable holder), and such locations may depend upon the type oftreatment to be administered by the system 10.

As described in further detail below, the delivery device 12 includes areservoir containing an infusion medium and delivers the infusionmedium, such as, but not limited to an insulin formulation, into thepatient-user's body in a controlled manner. Control instructions and/ordata may be communicated between the delivery device 12, the sensor ormonitor 14, the CCD 16 and the computer 18. The delivery device 12 maybe configured to secure to the skin of a patient-user 1, in the mannerof a patch, at a desired location on the patient-user. In suchembodiments, it is desirable that the delivery device 12 have relativelysmall dimensions for comfort and ability to conceal the device, forexample, under a garment.

Examples of patch-like delivery devices are described in U.S. patentapplication Ser. No. 11/211,095, filed Aug. 23, 2005, U.S. PatentApplication No. 60/839,822, filed Aug. 23, 2006, titled “Infusion MediumDelivery Device And Method For Driving Plunger In Reservoir” (attorneydocket no. 047711-0382), U.S. Patent Application No. 60/839,832, filedAug. 23, 2006, titled “Infusion Medium Delivery Device And Method WithCompressible Or Curved Reservoir Or Conduit” (attorney docket no.047711-0383), and U.S. Patent Application No. 60/839,741, filed Aug. 23,2006, titled “Infusion Pumps And Methods And Delivery Devices AndMethods With Same” (attorney docket no. 047711-0385), each of which isincorporated herein, in its entirety. A delivery device according toembodiments of the present invention may be configured in accordancewith any one of the delivery devices described in the above-referencedpatent applications, and further includes a needle inserter deviceaccording to needle inserter embodiments described herein. A deliverydevice according to further embodiments of the present invention may beconfigured in accordance with other suitable delivery device designs,and further includes or is connected with a needle inserter deviceaccording to needle inserter embodiments described herein.

An example of a delivery device 12 according to an embodiment of thepresent invention is shown in FIG. 2. The delivery device 12 includes abase housing portion 20 that, in some embodiments, may be disposableafter one or a number of specified uses, and a further housing portion22. For convenience, but without limitation, the base portion 20 isreferred to herein as a disposable housing portion or disposableportion, while the further housing portion 22 is referred to herein as adurable housing portion or durable portion. However, as noted above, inoperation, either or both housing portions 20 or 22 may be disposed ofor re-used, depending upon the context of use.

The disposable housing portion 20 may support structural elements thatordinarily contact the patient-user's skin or the infusion medium,during operation of the delivery device 12. On the other hand, thedurable housing portion 22 may support elements (including electronics,motor components, linkage components, and the like) that do notordinarily contact the patient-user or the infusion medium duringoperation of the delivery device 12. Thus, elements in the durablehousing portion 22 of the delivery device 12 are typically notcontaminated from contact with the patient-user or the infusion mediumduring normal operation of the delivery device 12.

In the illustrated embodiment, the disposable housing portion 20 of thedelivery device 12 includes a base 21 that includes or otherwisesupports a reservoir retaining portion 24 that houses a reservoir. Thedurable housing portion 22 may include a housing that secures onto thebase 21 adjacent the reservoir retaining portion 24, and may beselectively removed from the base 21, as shown in FIG. 3. The durablehousing portion 22 may house a suitable drive device, such as anelectrically operated motor (not shown in FIG. 2), and drive linkagecomponents (not shown in FIG. 2) for driving fluid out of the reservoir.The durable housing portion 22 also may house suitable controlelectronics (not shown in FIG. 2) for controlling the operation of thedrive device to drive fluid from the reservoir in a controlled manner.Further embodiments may include other electronics within the durablehousing portion 22, such as, but not limited to communicationelectronics (not shown in FIG. 2) for communicating with the sensor ormonitor 14, the CCD 16, the computer 18 and/or other components of thesystem 10 shown in FIG. 1.

The base 21 of the disposable housing portion 20 has a bottom surface(facing downward and into the page in FIGS. 2 and 3) that is configuredto secure to a patient-user's skin at a desired location on thepatient-user. A suitable adhesive may be employed at the interfacebetween the bottom surface of the base 21 and the patient-user's skin,to adhere the base 21 to the patient-user's skin. The adhesive may beprovided on the bottom surface of the base 21, with a peelable coverlayer 23 covering the adhesive material. In this manner, a patient-usermay peel off the cover layer 23 to expose the adhesive material and thenplace the adhesive side of the base 21 against the patient-user's skin.

The disposable portion 20 may include a button or other operator 25 foroperating a needle inserter device located within the reservoirretaining portion 24. Alternatively, or in addition, reference number 25may represent an opening 25, through which an external plunger oranother form of operator, may operate the needle inserter device, asdescribed below. The operator or opening 25 may be provided in alocation that is readily accessible from outside of the disposablehousing portion 20, when the disposable housing portion 20 is secured toa patient-user's skin. For example, in the illustrated embodiment, theouter wall on which the operator or opening 25 is located is a top wallof the disposable housing portion, facing a direction substantiallyopposite to the facing direction of the bottom surface that has theadhesive layer and peelable cover layer 23. Alternatively, or inaddition to an operator or opening 25, the needle inserter device may beactivated, through a wireless link, from an external controller, such asthe CCD 16, sensor or monitor 14 or computer 18. For such embodiments,the CCD 16, sensor or monitor 14 or computer 18 includes a wirelesssignal transmitter, while the delivery device includes a receiver forreceiving a wireless actuation signal and an electronic actuator that iscontrolled to actuate the needle inserter device, upon receipt of anactuation signal from the CCD 16, sensor or monitor 14 or computer 18.

The durable housing portion 22 of the delivery device 12 includes ahousing shell configured to mate with and secure to the disposablehousing portion 20. The durable housing portion 22 and disposablehousing portion 20 may be provided with correspondingly shaped grooves,notches, tabs or other suitable features that allow the two parts toeasily snap together, by manually pressing the two portions together ina manner well known in the mechanical arts. In a similar manner, thedurable housing portion 22 and disposable housing portion 20 may beseparated from each other by manually applying sufficient force tounsnap the two parts from each other. In further embodiments, a suitableseal, such as an annular seal, may be placed along the peripheral edgeof the disposable housing portion 20 and/or the durable housing portion22, so as to provide a liquid, hermetic, or air-tight seal between thedisposable housing portion 20 and the durable housing portion 22.

The durable housing portion 22 and disposable housing portion 20 may bemade of suitably rigid materials that maintain their shape, yet providesufficient flexibility and resilience to effectively snap together andapart, as described above. The base 21 material may be selected forsuitable compatibility with the patient-user's skin. For example, thedisposable housing portion 20 and the durable housing portion 22 of thedelivery device 12 may be made of any suitable plastic, metal, compositematerial or the like. The disposable housing portion 20 may be made ofthe same type of material or a different material relative to thedurable housing portion 22. The disposable and durable housing portionsmay be manufactured by injection molding or other molding processes,machining processes or combinations thereof.

The base 21 may be made of a relatively flexible material, such as aflexible silicone, plastic, rubber, synthetic rubber or the like. Byforming the base 21 of a material capable of flexing with thepatient-user's skin, a greater level of patient-user comfort may beachieved when the base is secured to the patient-user's skin. Also, aflexible base 21 can result in an increase in the site options on thepatient-user's body at which the base 21 may be secured.

The disposable housing portion 20 and/or the durable housing portion 22may include an internal sensor (not shown in FIGS. 2 and 3) forconnection to a patient-user, for example, through a needle (not shownin FIGS. 2 and 3) or a set of micro-needles for piercing apatient-user's skin when the disposable housing portion 20 is secured toa patient-user's skin. In such embodiments, a suitable aperture (notshown in FIGS. 2 and 3) may be formed in the base 21, to allow thepassage of the sensor needle or micro-needles, when the disposableportion is secured to the patient-user's skin. Alternatively, thedurable housing portion 20 of the delivery device 12 may be connected toan external sensor 14, through a sensor lead, as described with respectto FIG. 2 of U.S. patent application Ser. No. 11/211,095, filed Aug. 23,2005. The sensor may include any suitable biological sensing device,depending upon the nature of the treatment to be administered by thedelivery device 12. For example, in the context of delivering insulin toa diabetes patient, the sensor 14 may include a blood glucose sensor.Alternatively, or in addition, one or more environmental sensing devicesmay be included in or on the delivery device 12, for sensing one or moreenvironmental conditions. In further alternatives, the sensor may beincluded with as a part or along side the infusion cannula and/orneedle, such as for example as shown in U.S. patent Ser. No. 11/149,119filed Jun. 8, 2005, and entitled “Dual Insertion Set,” which isincorporated herein by reference in its entirety.

As described above, by separating disposable elements of the deliverydevice 12 from durable elements, the disposable elements may be arrangedon the disposable portion 20, while durable elements may be arrangedwithin a separable durable portion 22. In this regard, after one (or aprescribed number) of uses of the delivery device 12, the disposableportion 20 may be separated from the durable portion 22, so that thedisposable portion 20 may be disposed of in a proper manner. The durableportion 22 may, then, be mated with a new (un-used, user-filled,pre-filled, refurbished, re-filled or re-manufactured) disposableportion 20 for further delivery operation with a patient-user.

A reservoir 28 is located in the reservoir retaining portion 24 of thedisposable housing portion 20. The reservoir 28 may include a containerhaving an internal volume for containing a fluidic infusion medium, suchas, but not limited to an insulin formulation. The reservoir 28 may bemade of any material suitably compatible with the infusion medium,including, but not limited to suitable metal, plastic, ceramic, glass,composite material or the like. For example, the reservoir 28 may beformed of a plastic material referred to as TOPAS (trademark of Ticona,a subsidiary of Celanese Corporation), such as described in U.S. patentapplication Ser. No. 11/100,188, filed Apr. 5, 2005 (Publication No.2005/0197626).

In yet other embodiments, the reservoir 28 may be formed unitarily withthe reservoir retaining portion 24, for example, as a hollow chamberprovided within an otherwise solid portion of the reservoir retainingportion 24. In such embodiments, the hollow interior of the reservoirretaining portion 24 may be coated or lined in another manner with asuitable metal, plastic, plastic TOPAS (trademark of Ticona, asubsidiary of Celanese Corporation), ceramic, glass, composite materialor the like. Alternatively, or in addition, the retaining portion 24,itself, may be made of a suitable metal, plastic, plastic TOPAS(trademark of Ticona, a subsidiary of Celanese Corporation), ceramic,glass, composite material or the like.

The reservoir 28 has an outlet port (not shown), through which theinfusion medium contained within the interior of the reservoir 28 may becommunicated out of the reservoir. The outlet port is arranged in fluidflow communication with the interior of the reservoir 28 and isconnected, through any suitable fluid-flow conduit, in fluid flowcommunication with an injection site. In the embodiment in FIGS. 2 and3, the injection site is located within the disposable housing portion20 and is accessible through the opening 25. In other embodiments asdescribed below, the injection site may be located external to thedisposable housing portion 20 and connected to the reservoir 28, througha fluid flow conduit in the form of a flexible tube. In yet otherembodiments as described below, the injection site may be located on abase portion to which one or both of the disposable housing portion 20and the durable housing portion 22 may connect.

The fluid flow conduit may include a fluid-flow path that has a firstend in fluid flow communication with the outlet port of the reservoirand a second end in fluid flow communication with the injection site.The injection site may include a needle inserter device as describedherein, to assist the insertion of a needle or cannula into thepatient-user and connection of the needle or cannula in flowcommunication with the fluid flow conduit.

An example of a needle inserter device 40 according to an embodiment ofthe present invention is shown in FIGS. 4-6. The needle inserter device40 of FIGS. 4-6 operates with an external plunger device 41, describedbelow. The needle inserter device 40 includes a moveable needle 42supported within a housing structure 44. In the illustrated embodiment,the housing structure 44 may include a portion of the housing structureof the disposable housing portion 20 of FIGS. 2 and 3. In otherembodiments, the housing structure 44 may include the housing structureof another suitable drive device housing or a housing structure that isseparate from a drive device housing.

In addition to the moveable needle 42, the needle inserter device 40further includes a needle carriage 46, a hollow needle or cannula 48, afurther hollow needle 50, a first septum 52, a second septum 54 and abias member 56. The moveable needle 42, needle carriage 46 and cannula48 are supported for movement within the housing 44, from a retractedposition shown in FIG. 4, to an extended position in the direction ofarrow 58, along the axial direction A of the needle 42 and cannula 48.In the view of FIG. 5, the moveable needle 42, needle carriage 46 andcannula 48 are in a partially extended position. In the view of FIG. 6,the moveable needle carriage 46 and cannula 48 are in a fully extendedposition, while the moveable needle 42 has been returned to theretracted position. As described below, the needle inserter device 40operates with an external plunger device 59, configured to apply a forcealong the axis A of the moveable needle 42 and cannula 48, in thedirection of arrow 58, to move the moveable needle 50, needle carriage46 and cannula 48 in the direction of arrow 58.

The needle carriage 46 is configured to engage one or more (two shown inFIGS. 4-6) engagement pawls 60 connected to the housing 44, as theneedle carriage 46 moves into the extended position. Upon the needlecarriage 46 reaching a fully extended position, each of the engagementpawls 60 engage a surface 61 of the needle carriage 46. In theillustrated embodiment, the pawls 60 include a pair of protruding armsextending inward toward the axis A from a corresponding pair of struts62 that extend into the interior of the housing 44, from a bottom wall(relative to the orientation of FIGS. 4-6) of the housing 44. In afurther embodiment, a single, annular strut 62 may extend around thecircumference of the needle carriage 46 to support a single annular pawl60 or multiple pawls 60 around the circumference of the needle carriage46.

The struts 62 and pawls 60 may be configured unitary with the housing44, such as by forming the unitary structure in a mold and/or machinedor otherwise formed from a unitary piece of material. In such anembodiment the pawls may be provided with sufficient flexibility toallow them to flex downward, toward the struts 62 (as shown in FIG. 5)by the force of the needle carriage 46, as the needle carriage 46 ismoved toward the extended position, and sufficient resilience to returnto an unflexed position, upon the needle carriage 46 reaching a positionalong the direction of motion 58 at which the engagement surface 62passes the pawls 60, as shown in FIG. 6. Alternatively or in addition,the struts 62 may be provided with sufficient pivotal flexibility andresilience to flex or pivot outward (away from the axis A) and allow theneedle carriage 46 to sufficiently pass the pawls 60, whereupon thestruts 62 are allowed to flex or pivot back toward their unflexed ornon-pivoted position. When the struts 62 and/or pawls 60 are allowed toflex back toward an unflexed state, the pawls 60 engage the engagementsurface 62 of the needle carriage 46, to hold the needle carriage 46 inplace, as the needle 42 is returned to a retracted position, also asshown in FIG. 6.

In further embodiments, the pawls 60 may be formed as separate membersrelative to the struts 62, and may be connected to the struts 62 in amanner that allows the pawls 60 to flex and/or pivot downward, similarto the downward flex of the pawls 60 shown in FIG. 5, for example,through a suitable pivotal or flexible connection structure. A biasspring may be provided within the connection structure to bias the pawls60 toward their unflexed (or non-pivoted) position of FIG. 4. Also infurther embodiments, the struts 62 may be formed as separate structuralelements relative to the housing 44 and may be connected in a fixedrelation to the housing 44 by any suitable connection structure. Thehousing 44, struts 62 and pawls 60 may be formed of any suitablematerial having sufficient rigidity and flexibility to perform thefunctions described herein, such as a plastic, metal, composite materialor the like, as described above with respect to the disposable housingportion 20.

The moveable needle 42 includes a needle head 70 and a needle shaft 72.The needle head 70 and needle shaft 72 may be formed as a unitarystructure or as separate structures connected in a fixed relation toeach other. In one example embodiment, the needle head 70 includes around, disk-shaped structure, while the needle shaft 72 includes acylindrical structure extending from a central axis of the round,disk-shaped head and having a pointed tip for piercing a patient-user'sskin. The needle 42 may be made of any suitable material havingsufficient rigidity and biocompatibility to function to pierce apatient-user's skin and operate with other components as describedherein, such as, but not limited to NiTi, other metal, plastic, ceramic,composite materials or the like.

The needle carriage 46 is arranged adjacent (and below, in theorientation of FIGS. 4-6) the needle head 70. The needle carriage 46 mayinclude a generally disk-shaped body having a central passage 74 alongits axial dimension, through which the needle shaft 72 may extend. Thefirst septum 52 is arranged to cover one end of the central passage 74.In the illustrated embodiment, the disk-shaped body of the needlecarriage 46 has a recess 76 for containing at least a portion of thefirst septum 52, where the recess is located on a surface of thedisk-shaped body that faces the needle head. The first septum 52 isretained within the recess 76 and secured in a fixed relation relativeto the needle carriage 46, to allow the needle shaft 72 to pierce thefirst septum (when the needle 42 and needle carriage 46 are in theposition shown in FIGS. 4 and 5), and also allow the needle shaft 72 tobe withdrawn from the first septum 52, when the needle 42 is returned tothe retracted position (as shown in FIG. 6). For example, the firstseptum 52 may be retained within the recess 76 by frictional engagement,adhesive, thermal coupling or other suitable connection structure.

The needle carriage 46 includes a fluid flow passage 78 in fluid flowcommunication with the central passage 74. The further hollow needle 50has a hollow fluid flow path connected in fluid flow communication withthe passage 78. The hollow needle 50 extends from the needle carriage 46(downward in the orientation of FIGS. 4-6), in a direction generallyparallel to the axis A of the needle 42 and cannula 48, but spaced toone side of the axis A. The hollow needle 50 has a sharp tip that isdirected toward the second septum 54 and positioned to pierce the secondseptum 54, as the needle carriage 46 is moved toward the extendedposition, as shown in FIGS. 5 and 6.

The cannula or hollow needle 48 may include a hollow, cylindricaltube-shaped structure. For patient comfort, the outside diameter of thecannula 48 may be as small as possible, so that the cannula can beplaced through the patient-user's skin, with minimal traumatic effect onthe patient-user. The inside diameter of the hollow tube-shapedstructure of the cannula 48 is larger than the outer diameter of theneedle shaft 72, to allow the needle shaft 72 to extend through thecannula 48, when the needle 42, needle carriage 46 and cannula 48 are inthe retracted position, as shown in FIG. 4, yet allow the needle to bewithdrawn from at least a portion of the cannula 48, as described below.

The length of the cannula 48 along the axial direction A, is selected tobe long enough to extend through a patient-user's skin and to a desiredlocation within the patient-user for delivering the infusion medium,when the cannula is in the extended position, as shown in FIG. 6, yet beshort enough (relative to the length of the needle shaft 72, to allowthe sharp end of the needle shaft 72 to extend out from the end of thecannula, when the needle 42, needle carriage 46 and cannula 48 are inthe retracted position, as shown in FIG. 4. The cannula 48 may be madeof any suitable material having sufficient rigidity and biocompatibilityto function as described herein, such as, but not limited to metal,plastic, ceramic, composite materials or the like.

One end of the cannula 48 has a flared (enlarged diameter) end that isarranged to remain external to the patient-user, when the cannula is inthe extended position as shown in FIG. 6. The flared end of the cannula48 is secured to the needle carriage 46, with the hollow interior of thecannula 48 arranged in fluid flow communication with the central passage74 of the needle carriage 46. The flared end of the cannula 48 may besecured to the needle carriage 46, by any suitable connection structure,including, but not limited to, a friction fit with a funnel-shapedextension of the needle carriage, adhesive, thermal coupling or thelike. In further embodiments, the flared shape of the end of the cannula48 may be omitted and the cannula 48 may have a constant outer diameteralong its entire length.

The bias member 56 is configured to apply a bias force on the needle 42,in the direction opposite to the direction of arrow 58. The bias member56 may include any suitable structure that provides a bias force on theneedle 42, including, but not limited to, a spring configuration, apermanent magnet, an electro-magnet or the like. In the exampleembodiment of FIGS. 4-6, the bias member 56 includes a coil spring,which is configured to be compressed into a compressed state as shown inFIG. 5 and, when released, to expand to the expanded state shown in eachof FIGS. 4 and 6, when no external force is applied on the needleinserter device. In particular, the coil spring bias member 56 maycompress to and beyond the state shown in FIG. 5 to allow each of thepawls 60 to engage an engagement surface 62 of the needle carriage 46,when a sufficient external force is applied to the needle inserterdevice by the plunger device 41 in the direction of arrow 58. The coilspring may be made of any suitable spring material, including, but notlimited to, metal, plastic, composite material or the like.

In the embodiment of FIGS. 4-6, the coil spring bias member 56 isarranged around and generally coaxially with the axis A. The coil springbias member 56 extends from the needle head 70 to the top of the struts62. An annular groove 80 may be provided in the bottom surface (relativeto the orientation shown in FIGS. 4-6) of the needle head 70, forreceiving a portion of a first end of the coil spring bias member 56, tohelp retain the coil spring bias member 56 in place relative to theneedle head 70. In some embodiments, the first end of the coil springmay be secured to the needle head 70 by any suitable connectionstructure including, but not limited to, adhesive, straps, thermalcoupling, or the like.

The struts 62 may include grooves 82 (or an annular groove 82, forembodiments in which a single annular strut 62 is employed) forreceiving a portion of a second end of the coil spring bias member 56,to help retain the coil spring bias member 56 in place relative to thestruts 62. In further embodiments, the first end of the coil spring biasmember 56 may be secured to the needle head 70 and/or the second end ofthe coil spring bias member 56 may be secured to the struts 62, by anysuitable connection structure including, but not limited to, adhesive,straps, thermal coupling, or the like.

The first and second septa 52 and 54 may be made of any suitablematerial that can be pierced by a needle and form a seal around theneedle. The material for septa 52 may be a material that reseals theneedle hole after the needle has been removed from septum. Such septummaterial may include, but is not limited to, a suitable rubber, plasticor the like. As described above, the first septum 52 is supported on theneedle carriage 46, for providing a pierceable seal over one end of thecentral passage 74 of the needle carriage 46. The second septum 54 issupported by the housing structure 44, adjacent an opening of a fluidflow passage 84. The second septum 54 provides a pierceable seal overthe fluid flow passage 84. The fluid flow passage 84 may be a channelformed in the housing structure 44, as shown in FIGS. 4-6. In otherembodiments, the fluid flow passage 84 may include a tube or otherconduit structure located within the housing 44. The fluid flow passage84 is connected, in fluid flow communication, with a reservoir connector86.

The reservoir connector 86, may be any suitable connection structurethat may be selectively (or, in some embodiments, permanently) connectedto a reservoir 28, to provide fluid flow communication with the interiorof the reservoir 28. For example, the reservoir connector 86 may includea typical Luer-type connector having a cap structure 88 for receiving anoutlet port of the reservoir, a hollow needle 90 for piercing a septum92 within the outlet port of the reservoir 28. The fluid flow passage 84is arranged in fluid flow communication with the needle 90. Accordingly,a reservoir 28 may be selectively engaged with the cap 88, to connectthe interior of the reservoir 28 in fluid flow communication with thefluid flow passage 84, through the needle 90. In other embodiments, theneedle 50 and septum 54 may be eliminated and, instead, a continuousflow path (such as, but not limited to, a flexible tubing) may becoupled to the reservoir 28 and to the central passage 74 or passage 78,and able to flex, stretch or otherwise accommodate movement of theneedle carriage 46 relative to the housing structure 44 and maintain afluid flow path between the reservoir 28 and the central passage 78. Inyet further embodiments, the connector 86 may be eliminated, forexample, by connecting the flexible tubing directly to the reservoir.

The needle inserter device 12 of FIGS. 4-6 is configured to insert ahollow needle or cannula into a patient-user's skin, for providing fluidflow communication between the reservoir 28 and the patient-user, whenthe housing structure 44 (such as the housing structure of thedisposable housing portion 20 in FIGS. 2 and 3) is secured to apatient-user's skin. In operation, the needle inserter device 12 isconfigured to move between a retracted state (FIG. 4) and an extendedstate (where FIG. 5 shows movement toward the extended state). Inaddition, the needle inserter device has a return state (FIG. 6), atwhich the hollow needle or cannula 48 and needle carriage 46 are in theextended position, while the moveable needle 42 is returned to aretracted position.

In one embodiment, an external plunger device 41 is employed to causethe needle inserter device to move between a retracted state and anextended state. The plunger 41 may include a hand-held, spring-loadedpiston device, which is selectively actuated to provide a relativelyabrupt piston motion in the direction of the arrow 58. In otherembodiments, the plunger 41 may be controlled to provide a slow needleinsertion rate, to minimize traumatic effects to certain patient-users.

For example, the plunger device 41 may include a movable plunger havinga plunger head that has a size and shape to allow easy insertion intothe opening 25 in the housing structure 44, to engage the needle head70. The plunger head is selectively activated to be driven in thedirection of arrow 58 and impart a force on the needle head 70, in thedirection of arrow 58. The force imparted by the plunger 41 on theneedle head 70 is sufficient to overcome the bias force of the biasmember 56, to move the needle 42 in the direction of the arrow 58,toward the extended position. The plunger may be spring-loaded, toprovide a relatively abrupt motion in the direction of arrow 58, whenactivated, to move the needle 42 relatively quickly, in the direction ofarrow 58.

As the needle 42 is moved downward (with respect to the orientation ofFIGS. 4-6), in the direction of arrow 58, the needle head 70 engages andforces the needle carriage 46 to move with the needle in the directionof arrow 58. As the needle carriage 46 is moved in the direction ofarrow 58, the cannula 48 attached to the needle carriage 46 is alsomoved in the direction of arrow 58. As the needle 42 and cannula 48 aremoved in the direction of arrow 58, the tip of the needle 42 thatextends out from the cannula 48 pierces the patient-user's skin. As theneedle 42 and cannula 48 continue to move in the direction toward theextended position, the needle 42 directs a portion of the length of thecannula 48 through the patient-user's skin to a desired depth.

As the needle 42 and needle carriage 46 move toward the extendedposition, the sharp end of the further hollow needle 50 engages andpierces the second septum 54, as shown in FIG. 5. When the needlecarriage 46 is moved into the fully extended position (as shown in FIG.6), the hollow needle 50 is extended through the second septum 54, tofluid flow communication between the fluid flow passage 84 in thehousing structure 44 and the fluid flow passage 78 in the needlecarriage 46.

Also as the needle 42 and needle carriage 46 move toward the extendedposition, the needle carriage 46 engages the pawls 60 and causes thepawls 60 to flex downward (relative to the orientation of FIG. 5), inthe direction of arrow 58, as the needle carriage 46 continues to movetoward the extended position. When the needle carriage 46 reaches theextended position (as shown in FIG. 6), the pawls 60 return toward theirun-flexed state and engage the engagement surface 62 of the needlecarriage 46, to hold the needle carriage 46 and the cannula 48 in theirextended position. Once the pawls 60 have engaged the engagement surface62 of the needle carriage 46, the plunger 41 may be removed bywithdrawing the plunger head through the opening 25. As the plunger 41is removed, the bias member 56 operates to return the needle 42 to theretracted position of the needle, leaving the needle carriage 46 andcannula 48 in the extended position, as shown in FIG. 6. As the needle42 retracts, the first septum 52 reseals itself.

As a result, the cannula 48 will be inserted into the patient-user andalso will be connected in fluid flow communication with the reservoir28. Thereafter, infusion medium within the reservoir 28 may beselectively delivered to the patient-user, through the cannula 48 andfluid flow passages 78 and 84, by operation of a drive device on thereservoir 28, as described above. The patient (or other user) mayreadily operate the needle inserter device by simple operations ofinserting the plunger 41 into the opening 25 (to engage the plunger withthe needle head 70), activating the plunger 41 (to drive the plunger inthe direction of arrow 58), and then withdrawing the plunger 41 from theopening 25.

A seal structure 94 may be provided between the needle head 42 and thehousing structure 44, to provide a seal around the opening 25. In theembodiment shown in FIGS. 4-6, the seal structure 94 may include one ormore o-ring seals, gaskets or other suitable seals arranged around theopening 25. One or more annular grooves 96 may be provided in the uppersurface (relative to the orientation of FIGS. 4-6) of the needle head70, for receiving one or more seals. One or more annular protrusions 98may be provided on an interior surface of the housing structure 44, forengaging the one or more seals, when the needle 42 is in the retractedposition, as shown in FIGS. 4 and 6. Alternatively, one or more seals 94and grooves 96 may be provided on an interior surface of the housingstructure 44, while the annular protrusion(s) may be provided on theneedle head 70. In further embodiments, a pierceable or removable sealmay be provided over the opening through which the needle and cannulaextend, when in the extended position. In addition, a seal may be formedbetween the housing structure 44 and the needle carriage 46, bycompression of a portion of the cannula 48 (the flared portion shown inthe upper end of the cannula 48, with respect to the orientation shownin FIG. 6) between the housing structure 44 and the needle carriage 46,when the needle carriage 46 is moved to the extended position (shown inFIG. 6). Accordingly, the cannula 48 (or, at least the flared end of thecannula 48 that is located between the housing structure 44 and theneedle carriage 46) may be made of a material that can be compressed toform a seal between the housing structure 44 and the needle carriage 46,when the needle carriage 46 is in the extended position (as in FIG. 6).

While an embodiment of a needle inserter device 40 in FIGS. 4-6 employsan external plunger 41 for moving the needle 42, needle carriage 46 andcannula 48 from a retracted position to an extended position, otherembodiments may employ internal activation and bias structure forimparting a force to selectively move those components into theretracted position. For example, FIGS. 7 and 8 show an embodiment of aneedle inserter device 140 in which a further bias member is selectivelyactuated to provide a bias force on a needle 142, needle carriage 146and cannula 148, in the direction toward an extended position.

The embodiment of FIGS. 7 and 8 is similar in certain structural andfunctional respects to the embodiment of FIGS. 4-6. For example, themoveable needle 142, needle carriage 146 and cannula 148 of FIGS. 7 and8 may be similar to the needle 42, needle carriage 46 and cannula 48 incertain respects. In addition, the embodiment of FIGS. 7 and 8 includefirst and second septa 152 and 154 and a further needle 150, similar tothe first and second septa 52 and 54 and needle 50 described above (or aflexible tubing instead of the second septum 54 and needle 50, asdescribed above). For example, the needle 142 includes a needle head 170and needle shaft 172, similar to the needle head 70 and needle shaft 72described above. Also, the embodiment of FIGS. 7 and 8 include flowchannels 178 and 184, which have similar structure and function as theflow channels 78 and 84, described above, for providing a fluid flowpath between a central passage 174 of the needle carriage 146 and areservoir (not shown in FIGS. 7 and 8).

However, unlike the embodiment of FIGS. 4-6, the embodiment of FIGS. 7and 8 includes a first bias member 155 for providing a bias force on theneedle carriage 146 in the direction of arrow 158, when the needlecarriage is in the retracted position shown in FIG. 7. For example, thebias member 155 may include a coil spring provided around and generallycoaxial with a central axis A of the needle 142 and cannula 148. Thecoil spring bias member 155 may be compressed to a compressed state asshown in FIG. 7 and, when released, may expand under its own springforce to an expanded state shown in FIG. 8. A first end of the coilspring bias member 155 is abutted against an interior surface of thehousing structure 144 (which may include a section of the disposablehousing portion 20 of the delivery device shown in FIGS. 2 and 3, or maybe a housing structure that is separate from the housing structure ofthe delivery device). The second end of the coil spring bias member 155is abutted against an upper surface (relative to the orientation shownin FIGS. 7 and 8) of the needle carriage 146.

The needle carriage 146 may include an annular groove for receiving aportion of the second end of the coil spring bias member 155, to helpretain the coil spring in place with respect to the needle carriage 146.Similarly, an annular groove may be provided in the interior surface ofthe housing structure 144, for receiving a portion of the first end ofthe coil spring bias member, to help retain the coil spring in placewith respect to the housing structure 144. The first and second ends ofthe coil spring bias member 155 may be secured to the housing structure144 and needle carriage 146, respectively, by any suitable connectionstructure including, but not limited to, adhesive, straps, thermalcoupling, or the like.

The coil spring bias member 155 is configured to be in a compressedstate, when the needle carriage 146 is in the retracted position (shownin FIG. 7), and an expanded state, when the needle carriage 146 is inthe extended position (shown in FIG. 8). When in the compressed stateshown in FIG. 7, the coil spring bias member 155 imparts a bias force onthe needle carriage 146, in the direction of arrow 158. The needlecarriage 146 may be held in the retracted position user (or other user)to selectively activate the needle inserter device by releasing theneedle carriage and allowing the force of the bias member 155 to movethe needle carriage 146 in the direction of the arrow 158. In theembodiment of FIG. 7, the actuation member 159 includes a rigid lever(or other structural member) that engages a stop surface 161 on theneedle carriage 146 and is moveable in the direction of arrow 163 (byactuation of a manual lever, button or other operator, not shown) to aposition in which the lever does not engage the stop surface 161, toallow the needle carriage 146 to move in the direction of arrow 158,under the force of the first bias member 155. While a manual lever,button or other operator may be employed to initiate movement of theactuation member 159, other embodiments may employ an automaticactivation mechanism for moving the actuation member 159 (or otherwiserelease the needle carriage 146 for movement in the direction of arrow158), such as, but not limited to, a mechanism that moves the actuationmember 159 or otherwise releases the needle carriage for movement, inresponse to an expiration of a period of time from a sensor detectingthe application of the delivery device (or components thereof) on theskin of user (or in another suitable location of operation). In yetother embodiments, suitable electronics may be included in the deliverydevice to allow the actuation member 159 (or other suitable mechanismfor releasing the needle carriage 146 for movement in the direction ofarrow 158) to be activated by a signal from the CCD 16 or the computer18, for example, through a programmed timing sequence or in response toan input from a user of the CCD 16 or computer 18.

The embodiment of FIGS. 7 and 8 includes a second bias member 156, forproviding a bias force on the needle 142, in the direction opposite tothe direction of arrow 158. In the example embodiment of FIGS. 7 and 8,the second bias member 156 includes a coil spring, which is configuredto be compressed to the state shown in FIG. 7 and expand under its ownspring force to the state shown in FIG. 8. The coil spring bias member156 may be made of any suitable spring material, including, but notlimited to, metal, plastic, composite material or the like, and isarranged around and generally coaxially with the longitudinal axis A ofthe needle shaft 172 and the cannula 148.

The upper surface (relative to the orientation direction of FIGS. 7 and8) of the needle carriage 146 may include an annular groove forreceiving a portion of the one end of the coil spring bias member 156,to help retain the coil spring in place with respect to the needlecarriage 146. Similarly, an annular groove 180 may be provided on thelower surface (relative to the orientation direction in FIGS. 7 and 8)of the needle head 170, for receiving a portion of the other end of thecoil spring bias member 156, to help retain the coil spring in placewith respect to the needle head 170. The ends of the coil spring biasmember 156 may be secured to the needle head 170 and needle carriage146, respectively, by any suitable connection structure including, butnot limited to, adhesive, straps, thermal coupling, or the like.

In the retracted position shown in FIG. 7, the coil spring second biasmember 156 is held in a compressed state, by at least one pivotal pawl160. In FIG. 7, one pawl 160 is shown. However, in other embodiments,two or more pivotal pawls, similar to pawl 160, may be located aroundthe perimeter of the needle carriage 146. The pawl 160 includes a rigidlever mounted to the needle carriage 146 by a pivotal connection 165,for pivotal motion in the directions of the double arrow 167. In FIG. 7,the pawl 160 is in a locking position, at which a surface of the pawlabuts the upper surface (relative to the orientation in FIG. 7) of theneedle head 170. In the locking position, the pawl 160 retains theneedle 142, against the force of the coil spring bias member 156, tomaintain the coil spring bias member 156 in its compressed state.

On the other hand, as the needle carriage 146 and cannula 148 are movedto the extended position, the pawl 160 engages an engagement surface 166on the housing structure 144 and pivots to disengage from the needlehead 170 and release the needle 142, as shown in FIG. 8. The surface ofthe pawl 160 that engages the engagement surface 166 may be providedwith an angle surface (having an angle or curvature relative to thelongitudinal axis A direction) and the engagement surface 166 may beangled in a corresponding direction, to enhance pivotal motion of thepawl 160, as the needle carriage is moved into an extended position.

Upon the pawl 160 being pivoted to release the needle 142, the biasforce of the coil spring second bias member 156 causes the needle 142 tobe returned to the retracted position, leaving the needle carriage 146and cannula 148 in the extended position, as shown in FIG. 8. When theneedle 142 is returned to the retracted position, the septum 152re-seals itself and the cannula 148 is arranged in fluid flowcommunication with the reservoir (not shown), through the fluid flowpassages 178 and 184, in a manner similar to the manner in which cannula48 is arranged in fluid flow communication with the reservoir 28,through passages 78 and 84 in FIG. 4.

In operation, with the needle 142, needle carriage 146 and cannula 148in the retracted position (as shown in FIG. 7), the housing structure144 is secured to a user's skin, for example, in a manner similar tothat described above with respect to securing the disposable housingportion 20 to a user's skin. The patient-user (or other user) mayactivate the needle inserter device by moving the activation lever 159from the stop surface 161 of the needle carriage, to release the needlecarriage. Upon releasing the needle carriage 146, the force of the coilspring first bias member 155 abruptly moves the needle carriage 146downward (relative to the orientation in FIG. 7) in the direction ofarrow 158, toward the extended position (i.e., toward the position shownin FIG. 8). As the needle carriage 146 is abruptly moved in thedirection of arrow 158, the pawl 160 that abuts the needle head 170causes the needle 142 to abruptly move downward (relative to theorientation in FIG. 7) in the direction of arrow 158, with the needlecarriage 146. In further embodiments, the bias member 155 and/or theneedle carriage 146 may include suitable motion damping structure or thelike for causing the needle 142 to move slowly into a patient-user'sskin, to minimize traumatic effects on the patient-user, upon releasingthe needle carriage 146.

As the needle carriage 146 nears the extended position (shown in FIG.8), a surface of the pawl 160 contacts the engagement surface 166.Further movement of the needle carriage 146 toward the extended positioncauses the pawl 160 to pivot about its pivot axis 165, to disengage theneedle head 170. When the pawl 160 is pivoted out of engagement with theneedle head 170, the bias force of the coil spring second bias member156 returns the needle 142 to its retracted position, leaving the needlecarriage 146 and cannula 148 in the extended position, as shown in FIG.8. As the needle 142 retracts, the septum 152 reseals itself.

As a result, the cannula 148 will be inserted into the patient-user andalso will be connected in fluid flow communication with a reservoir (notshown). Thereafter, infusion medium within the reservoir may beselectively delivered to the patient-user, through the cannula 148 andfluid flow passages 178 and 184, by operation of a drive mechanism onthe reservoir, as described above. The patient-user (or other user) mayreadily activate the needle inserter device by simple operation of theoperator that controls movement of the actuation lever 159.

While the embodiment in FIGS. 7 and 8 employs a pivotal pawl 160, otherembodiments may employ other suitable catch mechanisms, including, butnot limited to, a rotary pawl, a flexible pawl, an electrically actuatedsolenoid or the like, for selectively retaining the needle 142 with theneedle carriage 146 and selectively releasing the needle 142 from theneedle carriage upon the needle carriage being moved toward or into itsextended position.

In the embodiment of FIGS. 4-6, an external plunger device 141 isemployed to impart a force on the needle 42, to move the needle, theneedle carriage 46 and the cannula 48 from a retracted position to anextended position. In the embodiment of FIGS. 7 and 8, a bias member,such as a coil spring, imparts a force on the needle carriage 146, tomove the needle carriage 146, needle 142 and cannula 148 to an extendedposition. In further embodiments, a rotary drive mechanism may beemployed for selectively moving the needle, needle carriage and cannulatoward and into an extended position.

For example, an embodiment of a rotary drivable needle inserter device212 is shown in FIGS. 9 and 10. The needle inserter device 212 mayinclude a structure 213 that includes a needle 242, needle carriage,cannula, a first septum, a bias member and a second septum (or aflexible tubing), similar to the needle 42, carriage 46, cannula 48,first septum 52, coil spring bias member 56 and second septum 54 (orflexible tubing) of FIGS. 4-6. Alternatively, the structure 213 mayinclude a needle 242, needle carriage, cannula, first and second septaand a bias member, similar to the needle 142, carriage 146, cannula 148,septa 152 and 154 and coil spring bias member 156 of FIGS. 7 and 8.While not shown in FIGS. 9 and 10, the needle inserter device 212 may besupported within a housing having a fluid flow path, reservoir connectorand reservoir, similar to the fluid flow path 84, reservoir connector 86and reservoir 28 shown in FIG. 4. Accordingly, the needle inserterdevice 212 operates in a manner similar to the manner of operation ofthe needle inserter devices 12 and 112, described above. However,actuation of the needle inserter device 212 is carried out by the rotarymotion of a rotatable cam member 250.

With reference to FIGS. 9 and 10, the rotatable cam member 250 includesa rotary disk-shaped member having a central axis, along the axialdirection A₁, which may be substantially parallel to the axis A of theneedle 242. The disk shaped cam member 250 may be made of any suitablyrigid material, including, but not limited to metal, plastic, ceramic,composite material or the like. The disk shaped cam member 250 has awidth that varies across its diameter, as shown in FIGS. 9 and 10, so asto be thinner on one side of the central axis A₁ than on the other sideof the central axis A₁. Accordingly, the disk-shaped cam member 250provides a rotatable wedge, which functions to move the needle 242 froma retracted position (shown in FIG. 9) to an extended position (shown inFIG. 10), as the disk shaped cam member 250 rotates from the positionshown in FIG. 9 to the position shown in FIG. 10.

The rotary disk shaped cam member 250 is supported for rotation aboutthe axis A₁, on a rotary shaft 251. The rotary shaft 251 is operativelycoupled, through suitable linkage structure (not shown), such as gears,belts, drive shafts or the like, to a drive device (not shown), forrotation about the axis A₁. The drive device and linkage structures (notshown), may include any suitable drive device and linkage structures forproviding selective rotational motion to the shaft 251. For example, anelectronic motor or other drive device described herein may be employed.In a further embodiment, the rotary shaft 251 may be operatively coupledto a wound spring (or windable spring), to provide rotary drive force tothe shaft 251, instead of an electronic motor. Further examples of drivedevice and linkage structures that selectively drive a rotatable shaftare described, for example, in U.S. patent application Ser. No.11/211,095, filed Aug. 23, 2005, U.S. Patent Application No. 60/839,822,filed Aug. 23, 2006 (attorney docket no. 047711-0382), and U.S. PatentApplication No. 60/839,832, filed Aug. 23, 2006 (attorney docket no.047711-0383), each of which is incorporated herein by reference.

In the retracted position of the needle 242 (shown in FIG. 9), thedisk-shaped cam member 250 may be arranged to abut (or be adjacent, butspaced from) the upper surface (relative to the orientation of FIG. 9)of the head 270 of the needle 252. In operation, the rotary cam member250 is driven in a rotational motion about the axis A₁ by selectiveoperation of a rotary drive device. A button, switch, or other operator(not shown) may be operatively connected to the drive device, a powersource therefore or the like, to allow a user to selectively activatethe drive device, in a manner well known in the art.

As the rotary cam member 250 rotates from the position shown in FIG. 9,the relatively wide portion of the disk-shaped cam member 250 is rotatedaround to abut the head 270 of the needle 252 and pushes the needle 252in the direction of arrow 258, into the extended position, as shown inFIG. 10. As described above with respect to the embodiments of FIGS.4-8, a needle carriage and cannula may be moved, with the movement ofthe needle 252, in the direction of arrow 258, to an extended position.Once the needle 242, needle carriage and cannula are moved into theextended position (FIG. 10), further rotation of the disk-shaped cammember 250 causes the relatively thin portion of the cam member 250 torotate around into engagement with the head 270 of the needle 252,allowing a bias member 256 (such as a coil spring, or the like) toreturn the needle 242 to the retracted position (shown in FIG. 9), whilethe needle carriage and cannula may remain in the extended position, asdescribed above with respect to the embodiments of FIGS. 4-8. In theembodiment of FIGS. 9 and 10, the rotary cam member 250 may becontrolled to rotate in a relatively fast, abrupt motion from theposition in FIG. 9 to the position in FIG. 10, to move the needle 252relatively abruptly through the patient-user's s skin, to minimizetraumatic effects on the patient-user. Alternatively, the rotary cammember 250 may be controlled to rotate in a relatively slow motion, tomove the needle 252 relatively slowly through the patient-user's skin,to minimize traumatic effects on other patient-users. The speed ofrotation of the rotary cam member 250 may be controlled by controllingthe speed of the drive device, and/or by providing speed reductiongearing or the like in the linkage structure that couples the drivedevice to the rotary cam member 250.

A further embodiment of a needle inserter device 312 capable of selfactivation and retraction is described with reference to FIGS. 11-13.The needle inserter device 312 includes a moveable needle-342, a needlecarriage, a cannula, a first septum, a bias member, and a further needleand a second septum (or flexible tubing), similar to the needle 42,carriage 46, cannula 48, first septum 52, coil spring bias member 56 andfurther needle 50 and second septum 54 (or flexible tubing) of FIGS.4-6. Alternatively, needle inserter device 312 may include a needle 342,needle carriage, a cannula, a first septum and a further needle andsecond septum (or a flexible tubing), similar to the needle 142,carriage 146, a cannula 148, first septum 152, coil spring bias member156 and further needle 150 and second septum 154 (or flexible tubing) ofFIGS. 7 and 8. While not shown in FIGS. 11-13, the needle actuator 312may be supported within a housing having a fluid flow path, reservoirconnector and reservoir, similar to the housing structure 44, fluid flowpath 84, reservoir connector 86 and reservoir 28 shown in FIG. 4.Accordingly, the needle actuator 312 operates in a manner similar to themanner of operation of the needle inserter devices 12 and 112, describedabove. However, actuation of the needle inserter device 312 is carriedout by a firing spring mechanism 350.

The firing spring mechanism 350 includes a spring having a coil portion351 and two arm portions 352 and 353, respectively, in accordance withcommon spring configurations of the type used in traditional mouse-trapstructures, or the like. The firing spring mechanism may be composed ofany suitable spring material, including, but not limited to metal,plastic, composite material, or the like.

One of the arms 352 of the firing spring mechanism 350 may be connectedin a fixed relation relative to a housing (such as the housing 44 or 144described above). The second arm 353 is biased, by the force of the coilportion 351 of the spring mechanism 350, in the direction of the arrow354. A actuator lever 355 is arranged to abut the second arm 353, tohold it in place against the bias force of the coil portion 351. Theactuator lever 355 is moveable, in response to the operation of a manualbutton, lever or other operator accessible to the patient-user (or otheruser), in the direction of arrow 356 (or other suitable direction, e.g.,into or out of the plane of the page of FIG. 11), to selectivelydisengage the spring arm 353. Upon the actuator lever 355 disengagingthe spring arm 353, the spring arm 353 is caused to abruptly move in thedirection of arrow 354, by the force of the coil portion 351.

As the spring arm 353 is moved in the direction of arrow 354, the springarm 353 initially contacts the head 370 of the needle 342, as shown inbroken lines in FIG. 11. As the spring arm 353 continues to move in thedirection of arrow 354, the spring arm 353 pushes downward (relative tothe orientation direction of FIG. 11) on the needle head 370, in thedirection of arrow 357, to cause the needle 342 (and the needle carriageand cannula) to move into an extended position. In the extendedposition, the cannula is connected in fluid flow communication with areservoir, for example, in a manner similar to that described above withrespect to the connection of the cannula 48 with the reservoir 28,through the fluid flow passages 78 and 84, in FIG. 4. While the springarm 353 may be allowed to move in the direction of arrow 354 (upon theactuator lever disengaging the spring arm 353) in an abrupt motion tominimize trauma to certain patient-users, in further embodiments, amotion damping mechanism may be coupled to the spring arm 353 and/or theneedle 342, to cause the needle 342 to move slowly in the direction ofarrow 354 (when actuated), to minimize traumatic effects to otherpatient-user.

Upon engaging the needle head 370 and moving the needle 342 in thedirection of the arrow 357, the spring arm 353 continues to move in thedirection of arrow 354 and engages a pivotal lever 359. The pivotallever 359 may include a suitably rigid structure that is mounted forpivotal motion about a pivot axis 361 and includes a stop surface 363arranged to engage the upper surface (in the orientation of FIG. 11) ofthe needle head 370, to hold the needle head in a partially extendedposition (as shown in FIG. 11) against the force of a return spring 365.

The return spring 365 may include a coil spring or other suitable biasmechanism, for biasing the needle 342 in the direction opposite to thedirection of arrow 357. In the embodiment of FIG. 11, the return spring365 is disposed around and generally coaxial with the shaft of theneedle 342, and has one end that abuts the lower surface (relative tothe orientation of FIG. 11) of the needle head 370. A second end of thereturn spring 365 abuts an upper surface (relative to the orientation ofFIG. 11) of a positioning channel structure 346. The positioning channelstructure may include a portion of the housing structure 44 describedabove, or a further structure (made of suitably rigid material, such as,but not limited to, plastic, metal, ceramic, composite material, or thelike) located within the housing structure 44 described above.

Upon engaging the pivotal lever 359, further movement of the spring arm353 in the direction of the arrow 354, by the force of the coil portion351, causes the spring arm 353 to pivotally move the pivotal lever 359to a position at which the stop surface 363 of the lever 359 isdisengaged from the needle head 370, as shown in FIGS. 12 and 13. Whenthe lever 359 pivots to disengage the needle head 370, the coil spring365 is allowed to expand under its own spring force, to move the needle342 to a retracted position, as shown in FIGS. 12 and 13.

Accordingly, as the spring arm 353 moves in the direction of the arrow354, from the position shown in FIG. 11 to the position shown in FIGS.12 and 13, the spring arm 353 engages the needle head 370 and forces theneedle 342 downward (relative to the orientation of FIG. 11) toward anextended position, whereupon the cannula is inserted through apatient-user's skin and is locked into place, in fluid flowcommunication with a reservoir. The spring arm 353 continues its motionin the direction of arrow 354, to engage the pivotal lever 359 andpivotally move the pivotal lever 359 out of engagement with the needlehead 370. Upon disengagement of the pivotal lever 359 with the needlehead 370, the spring 365 moves the needle to its retracted position,leaving the cannula in place, extending through the patient-user's skin.The spring tension of the spring 365 may be selected so as to provide arelatively abrupt motion of the needle to its retracted position, tominimize discomfort to the patient-user. In further embodiments, amotion reduction mechanism may be coupled to the spring, or needle 342to cause the needle 342 to move slowly through the patient-user's skin,to minimize discomfort to other patent-users.

While various embodiments described above employ bias members in theform of coil springs, other embodiments may employ other types of biasmembers, suitable to provide a sufficient bias force in the directionsdescribed herein. For example, other spring arrangements may be employedto provide a bias force for inserting a moveable needle and cannula intoa patient-user and/or a bias force for removing the needle, whileleaving the cannula in place. An example embodiment of a needle inserterdevice 412 that employs a single leaf type spring to provide both biasforces is shown in FIGS. 14-16.

Similar to embodiments described above, the needle inserter device 412of FIGS. 14-16 includes a moveable needle 442 that is moveable relativeto a housing structure 444. Similar to the above embodiments, themoveable needle 442 may be extended through a central passage in aneedle carriage 446 and through a cannula 448 (as shown in FIGS. 14 and15), but also may be withdrawn from at least a portion of the cannula448 (as shown in FIG. 16). The housing structure 444 may be similar tothe housing structure 44 or 144 described above. The carriage 446 may besimilar to the carriage 46 or 146 described above, including a furtherhollow needle and fluid flow passage (such as described above withrespect to the further needle 50 and fluid flow path 78 of FIG. 4) forpiercing a septum and coupling in fluid flow communication with a fluidflow path in or supported by the housing structure 444 (such asdescribed above with respect to the septum 54 and fluid flow path 84 ofFIG. 4).

The needle carriage 446 is supported for motion in the direction ofarrow 458 and may be guided by rails, ribs, walls or other structuralfeatures 450 of or in the housing 444, provided along that direction ofmotion. In FIG. 14, the needle inserter device 412 is shown in a readystate, in which the needle carriage 446, needle 442 and cannula 448 aresupported in a retracted position and ready to be activated. In FIG. 15,the needle inserter device 412 is shown in an insert state, in which theneedle carriage 446, needle 442 and cannula 448 have been moved to anextended position where the needle 442 and cannula 448 may pierce theskin of a patient-user on whom the housing 444 is secured. In FIG. 16,the needle inserter device 412 is shown in a needle retract state, inwhich the needle 442 has been retracted from the patient-user and atleast a portion of the cannula 448.

The needle inserter device 412 has a bias member, such as leaf spring456, to provide a bias force for moving the needle 442, needle carriage446 and cannula 448 from the ready state (retracted positions) of FIG.14, to the insert state (extended position) of FIG. 15. The leaf springbias member 456 also provides a bias force for moving the needle 442from the insert state (extended position) of FIG. 15 to the needleretract state of FIG. 16.

In particular, the leaf spring 456 is secured at one end portion 457 toan anchor structure 459, and a second end portion 461 secured to thehead 470 of the needle 442. The leaf spring 456 has a natural tendencyto be relatively straight, between the two end portions 457 and 461.When the needle 442, needle carriage 446 and cannula 448 are in theready state (retracted position) of FIG. 14, the leaf spring 456 isarched or bowed against its natural spring force, to impart a bias forceon the needle 442 in the direction of the arrow 458.

The needle 442, needle carriage 446 and cannula 448 may be held in placein the ready state (retracted position) of FIG. 14 by any suitabletrigger mechanism. In one embodiment, the trigger mechanism may includea moveable pin or lever 463 that extends through an opening 465 in thehousing structure 444 and has one end 467 located inside of the housingstructure 444, for engaging the end portion 461 of the leaf spring 456.The pin or lever 463 and or the end portion 461 of the leaf spring 456may include a catch mechanism, latch, hook or other configuration thatallows the pin 463 to hold the end portion 461 of the leaf spring 456 inthe arched or bowed state of FIG. 14, against its natural spring force,yet allow the pin or lever 463 to be selectively, manually moved todisengage the end portion 461 of the leaf spring 456 and release theleaf spring 456. Once the pin or lever 463 releases the leaf spring 456,the natural spring force of the leaf spring 456 moves the needle 442,needle carriage 446 and cannula 448 in the direction of arrow 458, tothe insertion state of FIG. 15. The pin or lever 463 has a second end469, located outside of the housing structure 444, for manual activationby a patient-user (or other user).

As described above, by manually activating the pin or lever 463 todisengage the end portion 461 of the leaf spring 456, the leaf spring456 moves the needle 442, needle carriage 446 and cannula 448 in thedirection of arrow 458, to the insertion state of FIG. 15. Morespecifically, the end portion 461 of the leaf spring 456 pushes downward(in the orientation shown in FIG. 14), in the direction of arrow 458, onthe head 470 of the needle 442. The force of the leaf spring 456 isconveyed by the needle head 470 to the needle carriage 446 and cannula448, to drive those components to the insertion state (extendedposition) shown in FIG. 15. As the needle 442 is moved to the insertionstate (extended position), the sharp end of the needle that protrudesfrom the end of the cannula 448 pierces the patient-user's skin andinserts the cannula 448 into the patient-user. At the same time, thecannula 448 may be connected in fluid flow communication with areservoir (for example, in the manner described above with respect toFIGS. 4-8) Alternatively, a reservoir (not shown in FIGS. 14-17) may beconnected in fluid flow communication with the central passage of theneedle carriage 446, through a flexible conduit 471 that moves and/orflexes with the movement of the needle carriage 446. Also, otherembodiments described above with respect to FIGS. 4-13 may include aflexible conduit (similar to conduit 471) connected to the centralpassage of the needle carriage 446 and in fluid flow communication witha reservoir (e.g., instead of the further hollow needle 50, fluidchannels 78 and 84 and septum 54 described above with respect to FIGS.4-6).

When the needle carriage 446 is moved to the insertion state (extendedposition) of FIG. 15, the needle carriage 446 is locked into position bya locking pawl 460. In particular, a locking pawl 460 extends into thepath of motion of the needle carriage 446 and is engaged by the needlecarriage 446, as the needle carriage 446 is moved to the insertion state(extended position) of FIG. 15. The pawl 460 is supported on or in thehousing structure 444 and may be similar in structure and function tothe pawl 60 described with respect to FIGS. 4-6.

The pawl 460 may bend or pivot downward (relative to the orientation ofFIGS. 14-16) as at least a portion of the needle carriage 446 passes thepawl 460, until a stop surface 462 on the needle carriage 446 moves pastthe pawl 460. Upon the stop surface 462 moving past the pawl 460, thepawl 460 is allowed to flex or pivot back toward its un-flexed ornon-pivoted position and engages the stop surface 462. With the pawl 460engaging the stop surface 462, the needle carriage 446 is inhibited frommoving upward (relative to the orientation of FIGS. 14-16) in thedirection opposite to the direction of arrow 458. In that manner, theneedle carriage 446 and cannula 448 may be held in place, in the insertstate (extended orientation) of FIG. 15.

The position of the needle head 470, when the needle carriage 446 is inthe insert state (extended position) of FIG. 15 is below (in theorientation of FIG. 15) the position of the end portion 461 of thespring 456 in its unflexed, natural or straight orientation (shown inbroken lines in FIG. 15 and in solid lines in FIG. 16), such that theleaf spring 456 is arched or bowed against its natural spring force,when in the insert state (extended orientation) of FIG. 15. Accordingly,upon the spring 456 moving the needle 442, needle carriage 446 andcannula 448 to the insert state (extended position) of FIG. 15, the leafspring automatically returns to its unflexed, straight state and, indoing so, imparts a force on the needle head 470 to move the needle 442in the direction opposite to the direction of arrow 458, to the needleretract state shown in FIG. 16. As the needle 442 is moved in thedirection opposite to the direction of the arrow 458, the needle 442 iswithdrawn from the patient-user and from at least a portion of thecannula 448, leaving the cannula 448 in place, in the patient-user andready to deliver the infusion medium to the patient-user.

The spring tension of the leaf spring 456 may be selected so as toprovide a relatively abrupt motion of the needle 442, needle carriage446 and cannula 448 from the ready state (retracted position) of FIG. 14to the insert state (extended position) of FIG. 15 and to also provide arelatively abrupt motion of the needle 442 from the insert state(extended position) of FIG. 15 to the needle retract state of FIG. 16.Also, the motion of the needle 442 may be relatively smooth and steady,by the action of the leaf spring and the guide structure 450. In thatmanner, trauma on the patient-user may be minimized. Alternatively, thespring tension may be selected and/or a motion damping mechanism may beprovided to cause the needle 442 to move slowly toward the extendedposition (FIG. 15), to minimize trauma to other patients-users. Otherembodiments described above with respect to FIGS. 4-13 may includesimilar guide structure for guiding the needle carriage in its motion.

A further embodiment of a needle inserter device 512 is described withrespect to FIGS. 17-19. The needle inserter device 512 (shown in FIG.17) includes a housing portion 544, which may be similar in certainmanners to the housing portion 44 described above with respect to FIGS.4-6. However, the housing portion 544 includes a channel 550 thatextends through skin-facing surface 545 of the housing portion base to apatient-user's skin, when the housing portion 544 is secured to apatient-user's skin as described above with respect to housing portion44.

The channel 550 includes a cannula passage 552 that opens to thepatient-user's skin, when the housing portion 544 is secured to apatient-user. The channel 550 also includes a suitable locking structure554, for engaging a surface of a cannula nest and holding the cannulanest in place, as described below. The locking structure 554 mayinclude, for example, one or more flexible or pivotal tabs arrangedaround the longitudinal axis A₂ of the channel 550 and passage 552,where each tab has a lip 556 that extends inward toward the axis A₂.Alternatively, other suitable locking structures, including, but notlimited to, frictional fitted structures or the like, may be employed.

The needle inserter device 512 operates with an external needle injector560 (shown in FIG. 19). The needle injector 560 operates to insert aneedle 542 and cannula 548 into a patient-user's skin, through thechannel 550 and then remove the needle 542, while leaving the cannula548 in place. With the cannula 548 in the patient-user and extending atleast partially into the channel 550, the cannula may be connected influid flow communication with a reservoir 528, as described below. Theneedle 542, cannula 548 and reservoir 528 may be similar in structureand function in certain manners to the needle 42, cannula 48 andreservoir 28, described above.

The needle injector 560 has a tubular body 562 with a hollow interiorcontaining a coil spring 564 and a plunger head 566. A shaft 568 isfixed to and extends from the plunger head, along the longitudinal axisA₃ of the tubular body 562, and through an opening in an end wall 570 ofthe tubular body 562, to a location outside of the tubular body 562. Ahandle 572 may be provided on the outside end of the shaft 568. The coilspring 564 is arranged around the longitudinal axis A₃ of the tubularbody 562 and has one end abutting the end wall 570 of the tubular body562 and an opposite end abutting the plunger head 566.

The needle 542 is attached to the plunger head 566, opposite to the sideof the plunger head that abuts the coil spring 564. The needle 542extends along the direction of the longitudinal axis A₃ of the tubularbody 562 and has a sharp end opposite to the end connected to theplunger head 566.

The cannula nest 574 may include a generally tubular body having acentral channel 576, a first end 578 and a second end 579. The first end578 has an end surface configured to engage the lip 556 of each lockingstructure tab 554, as described below. The second end 579 of the cannulanest 574 is formed integral with or otherwise connected in a fixedrelation to the cannula 548, with the cannula in fluid flowcommunication with one end of the central channel 576 of the cannulanest 574. A sealable septum 580 is secured to the cannula nest 574, overand sealing the end of the central channel 576 opposite to the end thatis connected to the cannula 548.

To operate, the housing structure 544 is secured to a patient-user'sskin, with the surface 545 facing the patient-user's skin. A cannulanest 574 and cannula 548 assembly is attached to the needle 542 of theinjector 560, by inserting the needle 542 through the septum 580 of thecannula nest and through the central channel 576 and cannula 548. Thenthe needle injector 560 is positioned adjacent the channel 550, with theaxis A₃ of the injector body 562 generally aligned with the axis A₂ ofthe channel 550 as shown in FIG. 19. The patient-user (or other user)may pull back on the handle 572 of the injector, to cause the plungerhead 566 to move toward the end wall 570 of the injector body 562 andcompress the coil spring 564 between the plunger head 566 and the endwall 570.

The patient-user (or other user) may then release the handle and allowthe coil spring to force the plunger head 566 in the direction away fromthe end wall 570 and, at the same time, push the needle 542 and cannula548 through the channel 550 and into the patient-user's skin. The springtension of the spring 564 is selected such that the motion of theplunger head 566 pushes the cannula nest 574 through the flexible orpivotal tabs 554 to a position at which the end surface 578 abutsagainst the lip 556 of each tab 554. As the cannula nest 574 is pushedthrough the tabs 554, the tabs 554 flex or pivot to allow the relativelywide portion of the cannula nest body to pass, before the tabs areallowed to flex or pivot back toward an unflexed or non-pivoted state atwhich the tab lips 556 engage the end surface 578 of the cannula nestand hold the cannula nest in place.

Upon the cannula nest 574 being locked into place by the tabs 554, thecoil spring 564 has extended beyond its natural, un-tensioned length, asa result of the momentum of the plunger head motion. Accordingly, thecoil spring 564 imparts a force on the plunger head 566 and needle 542,to cause the plunger head to move back toward the end wall 570 andwithdraw the needle 542 from the cannula nest 574 and cannula 548.Alternatively, or in addition, the needle injector 560 may be mannualymoved in the axial direction A₃ away from the channel 550, to pull theneedle 542 out of the cannula 548 and cannula nest 574. As the needle542 withdraws from the septum 580 in the cannula nest 574, the septum580 reseals itself, leaving the cannula in place in the patient-user'sskin and in fluid flow communication with the interior of the channel550.

Thereafter, the reservoir 528 may be connected in fluid flowcommunication with the channel 550, to allow fluid delivery from thereservoir 528, to the patient-user, though the cannula 548. Thereservoir 528 may be supported by the housing structure 544 and may beoperatively coupled to a drive device for driving the infusion mediumfrom the reservoir 528 into a conduit 530. The conduit 530 may includeany suitable tubing structure or passage having a fluid flow channelconnected in fluid flow communication with the interior of the reservoir528, for conveying fluid from the reservoir 528. For example, theconduit 530 may include a flexible, plastic tubing.

The conduit 530 is also provided in fluid flow communication with ahollow needle 532. The hollow needle 532 and a portion of the conduit530 may be supported on a cover member 534 that is pivotally connectedto the housing structure 544. The cover member 534 may be pivotal,relative to the housing structure 544, to a first position at which thechannel 550 is exposed for operation with a needle injector 560, asdescribed above, and to a second position to cover the channel 550. Thehollow needle 532 may be positioned on the cover member 534 at alocation at which the sharp end of the needle extends into the channel544, when the cover member 534 is pivoted to the second position overand covering the channel 550. Accordingly, a patient-user (or otheruser) may cause the hollow needle 532 to pierce and pass through theseptum 580 on a cannula nest structure located within the channel 550,to connect the reservoir 528 in fluid flow communication with thecannula nest structure and cannula 548.

A further embodiment of a needle inserter device 612 is described withrespect to FIGS. 20-23. The needle inserter device 612 (shown in FIG.20) includes a base portion 644, which may be arranged within adisposable housing portion 20 (shown in FIGS. 2 and 3). In otherembodiments, the needle inserter device 612 may be located in thedurable housing portion 22 or in an injection site module connected tothe disposable housing portion 20 or the durable housing portion 22, asdescribed herein. Alternatively, the needle inserter device 612 may beincluded in other systems that operate by inserting a needle into asubject or object.

The base 644 may include a generally rigid support structure having anaperture or opening, through which a needle and a cannula may extend, asshown in FIGS. 21 and 22. The base 64 supports a pair of pivotal arms646 and 648, for pivotal motion about a respective pair of pivot axis646 a and 648 a. A suitable hinge or pivot axle may be provided toconnect the pivotal arms 646 and 648 to the base 644. The base 644 andthe pivotal arms may be made of any suitably rigid materials, including,but not limited to metal, plastic, ceramic, composite material or thelike. While the embodiment in FIGS. 20-23 includes two pivotal arms 646and 648, other embodiments may include no more than one pivotal arm ormore than two pivotal arms connected to the base 644 at respective pivotaxes.

The base 644 supports a pair of coil springs 650 and 652. The coilspring 650 is arranged to function as an insertion spring, while thecoil spring 652 is arranged to function as a retraction spring. Eachcoil spring 650, 652 has a coil wire member that is spirally woundaround an open coil interior. The open coil interiors of the coilsprings 650 and 652 are arranged coaxially and are aligned with theneedle or cannula opening in the base 644. A needle 654 is supported bythe insertion spring 650. The needle 654 includes a needle shaft 655 anda needle head 656. The insertion spring 650 has one end that abuts theneedle head 656 and a second end that abuts the base 644. A hollowcannula (not shown in FIGS. 20-23) may be arranged around the shaft 655of the needle.

The retraction spring 652 has one end that abuts a flange member 658 anda second end that abuts the base 644. In a starting position, theretraction spring 652 is arranged in a compressed state, between theflange member 658 and the base 644, as shown in FIG. 20. The pivotalarms 646, 648 may include a stop surface, such as projecting surfaces646 b and 648 b, for engaging the flange member 658, to hold the flangemember 658 in place against the force of the compressed retractionspring 652, when the pivotal arms 646 and 648 are in a locking positionas shown in FIG. 20.

While the pivotal arms 646 and 648 are in the locking position to holdthe flange member 658 and retraction spring 652 in place, a manual (orautomated) force may be applied to the needle head 656 (in the directionof arrow 659), to move the needle 654 against the force of the insertionspring 650. By applying a force on the needle head 656 in the directionof arrow 658, the needle 654 and a cannula on the needle shaft 655 maybe moved toward an insertion position as shown in FIG. 22, at which theinsertion spring 650 is compressed between the needle head 656 and thebase 644. As the needle 654 and cannula move from the position shown inFIG. 20 toward the position shown in FIG. 22, the needle 654 firstreaches a partially extended position shown in FIG. 21.

In the partially extended position shown in FIG. 21, the sharp end ofthe needle 656 and at least a portion of the cannula around the needleshaft 655 are extended through the opening in the base 644, to theposition shown in FIG. 21. Further force on the needle head 656 causesthe needle and cannula to continue to move in the direction of arrow658, to the fully extended position shown in FIG. 22. The cannula (notshown in FIGS. 21-23) may be supported on a carriage, similar to thecarriage 46 or 146 described above and may engage a locking mechanism,such as but not limited to, pawls 60 or 160 described above, when in thefully extended position of FIG. 22. In addition, the cannula (not shownin FIGS. 21-23) may be connected in fluid flow communication with areservoir, when in the fully extended position, for example, but notlimited to, the fluid flow connection structure described above withrespect to the cannula 48 or 148 and the reservoir 28. To simplify thepresent disclosure, reference is made to the description of the cannulalocking structure and fluid flow connection to the reservoir 28 of theembodiments in FIGS. 4-8. By supporting the base 644 at an injectionsite (either in the disposable housing portion 20, the durable housingportion 22 or an injection site module), the base 644 may be arrangedadjacent a patient-user's skin (for example, when the disposable housingportion 20, the durable housing portion 22 or the injection site moduleis arranged adjacent the patient-user's skin, as described above), toallow the sharp end of the needle 654 to pierce the patient-user's skinand to allow the cannula around the needle shaft to be inserted at leastpartially into the patient-user's skin, when the needle is in the fullyextended position of FIG. 22.

Once the needle 654 and cannula are in the partially extended positionof FIG. 21, further movement of the needle 654 in the direction of arrow658 to the position shown in FIG. 22 causes the needle head 656 toengage the pivotal arms 646 and 648 and pivot the arms 646 and 648 to anunlocked position as shown in FIG. 22. The pivotal arms 646 and 648 mayhave angled surfaces 646 c and 648 c, respectively, for engaging needlehead 656, to more efficiently transfer the linear motion of the needlehead 656 to pivotal motion of the arms 646 and 648, as the needle head656 engages and moves along the angled surfaces 656 c and 648 c in thedirection of arrow 658.

In the unlocked position of the arms 646 and 648, the flange 658 is nolonger held in place by the arms 646 and 648 against the force of theretraction spring 652. Accordingly, when the arms 646 and 648 are movedinto the unlocked position, the retraction spring 652 forces the flangemember 658 against the needle head 656 and forces the needle 654 to movein the direction opposite to the direction of arrow 658, to a retractedposition, as shown in FIG. 23. However, the cannula is left in place,extending into the patient-user's skin, similar to the function of thecannula 48 or 148 in the embodiments of FIGS. 4-8. Accordingly, theinsertion device shown in FIGS. 21-23 may be employed to insert a needleand cannula into a patient-user's skin and withdraw the needle, leavingthe cannula in place.

A further embodiment of a needle inserter device 712 is described withrespect to FIGS. 24-25. In FIG. 24, the needle inserter device 712 is ina retracted or starting position. In FIG. 25, the needle inserter device712 is in an extended position. The needle inserter device 712 (shown inFIG. 24) includes a housing portion 744, which may be arranged within adisposable housing portion 20 (shown in FIGS. 2 and 3).

In other embodiments, the needle inserter device 712 may be located inthe durable housing portion 22 or in an injection site module connectedto the disposable housing portion 20 or the durable housing portion 22,as described herein. Alternatively, the needle inserter device 712 maybe included in other systems that operate by inserting a needle into asubject or object. The housing 744 may include a rigid, generallycylindrical or disc-shaped body, having a hollow, generally cylindricalinterior and a longitudinal dimension along the axis A₃ of the generallycylindrical shape of the body. The interior surface of the housing 744has a spiral groove 746 that starts near, but spaced from, the top ofthe housing 744 (relative to the orientation shown in FIG. 24) andextends around the inner peripheral wall of the housing 744, to alocation near the base of the housing 744. A further, linear groove 748is provided at the base end of the spiral groove and extends toward thetop end of the housing (relative to the orientation shown in FIG. 24).The linear groove connects the base end of the spiral groove with thetop end of the spiral groove 746 and extends a short distance above thetop end of the spiral groove 746.

A cam member 750 is located within the interior of the housing 744 andhas a projection 751 that is arranged to extend into the grooves 746 and748. The housing 744 includes an opening 752 on one end (the top end inthe orientation of FIG. 24), through which the cam member 750 may beoperated by manual or automated force. A surface of the cam member 750may be exposed through the opening 752. That exposed surface of the cammember 750 may include a convex-shape, that extends into or partiallythrough the opening 752, when the cam member 750 is in a retractedposition, as shown in FIG. 24. The housing 744 also includes a needleopening 754 through the base of the housing 744, through which a needleand cannula may be extended, as described below.

The cam member 750 is supported within the interior of the housing 744by a coil spring 754. The coil spring 756 extends between the cam member750 and the base of the housing 744 and has one end secured to (oradjacent to) the base portion of the housing 744 and another end securedto the cam member 750.

In the starting or retracted position of FIG. 24, the coil spring 754 ispartially unwound against its natural wound state, such that the spring746 imparts a force on the cam member 750, in the winding direction ofthe spring. However, because the projection 751 of the cam member 750 islocated within the groove 748, the spring 746 is held in the partiallyunwound state, against the natural winding force of the spring 756.

From the retracted position shown in FIG. 24, a manual or automatedforce may be applied to the cam member 750, through the opening 752 inthe housing 744, to force the cam member to move in the axial directionA₅, along the direction of arrow 755 and partially compress the coilspring against the natural compression force of the spring, until thecam projection 751 moves along the linear groove 748, toward the base ofthe housing 744 to align with the top end (relative to the orientationof FIG. 24) of the spiral groove 746. Once the cam projection 751 isaligned with the spiral groove 746, the natural winding force of thespring 756 causes the cam member 750 to rotate and move toward the baseof the housing 744, while the cam projection 751 follows the spiralgroove 746, as the spring winds toward its natural, untensioned state ofwinding. However, as the cam member 750 moves toward the base of thehousing 744, the cam member 750 compresses the spring 756 against itsnatural longitudinal dimension (in the dimension from the of the axisA₃).

As the cam member 750 moves toward the base of the housing 744, a needle758 is moved through the opening 754 in the base of the housing 744, tothe extended position (shown in FIG. 25). The needle 758 is secured to asurface of the cam member that faces the base, so as to move with thebase from the start or retracted position of the cam member 750 andneedle 758 (shown in FIG. 24) to the extended position of the cam member750 and needle 758 (shown in FIG. 25). A cannula may be supported on theshaft of the needle 758, adjacent the sharp end of the needle.

By supporting the base of the housing 744 at an injection site (eitherin the disposable housing portion 20, the durable housing portion 22 oran injection site module), the housing 744 may be arranged adjacent apatient-user's skin (for example, when the disposable housing portion20, the durable housing portion 22 or the injection site module isarranged adjacent the patient-user's skin, as described above), to allowthe sharp end of the needle 758 to pierce the patient-user's skin and toallow the cannula around the needle shaft to be inserted at leastpartially into the patient-user's skin, when the needle is in theextended position of FIG. 25.

Once the needle 758 and cannula are in the extended position of FIG. 25,the cam projection 751 (which had followed the spiral path of the groove746) is aligned with the linear groove 748. At that position, the spring756 is extended in the longitudinal dimension of axis A₅ beyond itsnatural longitudinal state. Accordingly, the spring 756 provides a forceon the cam member 750, to move the cam member 750 in the axial dimensionA₅, in the direction opposite to the direction of arrow 755, while theprojection 751 follows the linear groove 748, to the retracted positionof FIG. 24. The cannula (not shown in FIGS. 24-25) may be supported on acarriage, similar to the carriage 46 or 146 described above and mayengage a locking mechanism, such as but not limited to, pawls 60 or 160described above, when in the fully extended position of FIG. 25. Inaddition, the cannula (not shown in FIGS. 24-25) may be connected influid flow communication with a reservoir, when in the fully extendedposition, for example, but not limited to, the fluid flow connectionstructure described above with respect to the cannula 48 or 148 and thereservoir 28. To simplify the present disclosure, reference is made tothe description of the cannula locking structure and fluid flowconnection to the reservoir 28 of the embodiments in FIGS. 4-8.Accordingly, as the cam member 750 moves toward the retracted position,the needle 756 is retracted from the patient-user, but the cannularemains in the patient-user. Accordingly, the insertion device shown inFIGS. 24 and 25 may be employed to insert a needle and cannula into apatient-user's skin and withdraw the needle, leaving the cannula inplace.

A further embodiment of a needle inserter device 812 is described withrespect to FIGS. 26-27. In FIG. 26, the needle inserter device 812 is ina retracted or starting position. In FIG. 27, the needle inserter device812 is in an extended position. The needle inserter device 812 includesa housing 844 that is similar to the housing 744 described above withrespect to FIGS. 24 and 25. However, the housing 844 has a needleaperture or opening 846 that is off-center, relative to the axis of thegenerally cylindrical shape of the housing 844. The needle inserter 812in FIGS. 26 and 27 includes a rotary disc 848, supported for rotation byan axle 850, at an obtuse angle relative to the axial dimension A₄,within the interior of the housing 844. A coil spring 852 in the form ofa coiled wire or ribbon is supported within the housing 844 and has onewire or ribbon end fixed with respect to the housing 844 and a secondwire or ribbon end secured to and fixed with respect to an off-centerlocation of the disc 848.

A needle 854 is supported within the housing 844, in alignment with theneedle opening 846. The needle 854 has a needle head 856 arranged toabut a surface of the disc 848, as the disc 848 rotates about the axisA₄. In one embodiment, a coil spring (not shown in FIGS. 26 and 27) isprovided between the needle head 856 and the base of the housing 844, tobias the needle in toward the retracted position of FIG. 26. The needlehead 856 may fit within a groove or shaped channel 858 provided in thehousing 844. The groove or channel 858 extends in the longitudinaldirection, parallel to the axis A₄.

When the disc 848 and needle 854 are in the starting position of FIG.26, the coil spring 852 is partially uncoiled (or coiled) against itsnatural spring force. The disc 848 may be held in the starting positionby a manually operable lever or other suitable mechanism that may berelease by manual operation. Once released, the coil spring 848partially coils (or uncoils) under its own spring tension and rotatesthe disc 848 about the axis A₄. Because the disc 848 is supported at anangle relative to the axis A₄, rotation of the disc 848 forces theneedle head 856 in the direction toward the base of the housing 844 and,thus moves the needle 854 toward the extended position shown in FIG. 27.

By supporting the base of the housing 844 at an injection site (eitherin the disposable housing portion 20, the durable housing portion 22 oran injection site module), the housing 844 may be arranged adjacent apatient-user's skin (for example, when the disposable housing portion20, the durable housing portion 22 or the injection site module isarranged adjacent the patient-user's skin, as described above), to allowthe sharp end of the needle 854 to pierce the patient-user's skin and toallow a cannula around the needle shaft to be inserted at leastpartially into the patient-user's skin, when the needle is in theextended position of FIG. 27. The cannula (not shown in FIGS. 26-27) maybe supported on a carriage, similar to the carriage 46 or 146 describedabove and may engage a locking mechanism, such as but not limited to,pawls 60 or 160 described above, when in the fully extended position ofFIG. 27. In addition, the cannula (not shown in FIGS. 26-27) may beconnected in fluid flow communication with a reservoir, when in thefully extended position, for example, but not limited to, the fluid flowconnection structure described above with respect to the cannula 48 or148 and the reservoir 28. To simplify the present disclosure, referenceis made to the description of the cannula locking structure and fluidflow connection to the reservoir 28 of the embodiments in FIGS. 4-8.

Once the disc 848 and needle 854 are in the extended position of FIG.27, further rotation of the disc 848 allows the needle 854 to beretracted back toward the retracted or starting position shown in FIG.26, while leaving the cannula in place at least partially within thepatient-user's skin. Retraction of the needle 854 may be provided, forexample, by the force of a coil spring or other suitable bias mechanism,as described above. Accordingly, the insertion device shown in FIGS. 26and 27 is another example of a structure that may be employed to inserta needle and cannula into a patient-user's skin and withdraw the needle,leaving the cannula in place. Alternatively, or in addition, the needlehead may be connected to, but ride within an annular groove within thedisc 848 so as to be pulled back by the disc into a retracted position,as the disc 848 completes a full 360 degree rotation.

A further embodiment of a needle inserter device 912 is described withrespect to FIGS. 28-31. FIGS. 28 and 29, show an external perspectiveview and a cross-sectional view, respectively, of the needle inserterdevice 912, with a needle and cannula in a retracted or startingposition. In FIG. 30, the needle inserter device 912 is shown, with theneedle and cannula in an extended position. In FIG. 31, the needleinserter device 912 is shown in a cross-sectional view, with the needlein a retracted position and the cannula in an extended position andconnected in fluid-flow communication with a fluid conduit.

More specifically, the needle inserter device 912 includes a housingportion 944, which may be arranged within a disposable housing portion20 (shown in FIGS. 2 and 3). In other embodiments, the needle inserterdevice 912 may be located in the durable housing portion 22 or in aninjection site module connected to the disposable housing portion 20 orthe durable housing portion 22, as described herein. Alternatively, theneedle inserter device 912 may be included in other systems that operateby inserting a needle into a subject or object.

The housing 944 includes a rigid body that has an interior channel 946with a longitudinal dimension along the axis A₄. The housing 944 may bemade of any suitably rigid material, including, but not limited tometal, plastic, ceramic, composite material or the like. The housing 944also has a slot-shaped opening 948 that is open to the interior channel946 and extends along at least a portion of the length of the interiorchannel 946, in the longitudinal dimension of the axis A₄. A hollowneedle 950 is supported within the channel 946 for movement relative tothe housing 944, between a retracted or start position (shown in FIGS.28 and 29), to an extended position (shown in FIG. 30), and back to aretracted position (shown in FIG. 31). The needle 950 may be made of anysuitable material, including, but not limited to metal, plastic,ceramic, glass, composite material or the like.

The hollow needle 950 has a hollow interior and a sharp end 950 aprovided with an opening into the hollow needle interior. The hollowneedle 950 also has a second end 950 b that has another opening into thehollow needle interior. A flexible fluid-flow conduit 952 is connectedin fluid-flow communication with the open second end 950 b of the needle950. The flexible conduit 952 is also connected (at another end, notshown in FIG. 29) to an infusion fluid reservoir, such as a reservoir inthe disposable housing portion 20 as described above, or anothersuitable reservoir, to connect a source of infusion fluid to the hollowneedle. The conduit 952 may be flexible, to flex and move with themotion of the needle 950, as the needle 950 moves between a retracted orstart position and an extended position.

A cannula 954 having a cannula nest 956 is supported on the needle 950,when the needle 950 is in a start position, as shown in FIG. 29. Thecannula may be made of any suitable material having sufficient rigidityto operate as described herein and may have sufficient flexibility forpatient-user comfort, including, but not limited to metal, plastic,ceramic, glass, composite material or the like. The nest 956 may be madeof any suitably rigid material that also has sufficient flexibility tooperate as described herein, including, but not limited to metal,plastic, ceramic, glass, composite material or the like. In oneembodiment, the nest 956 is made of a relatively flexible or softmaterial, such as, but not limited to a silicon, plastic or othersuitable material, to provide a sealing function, as described below.The nest 956 is rigidly secured to one end of the cannula 954. Infurther embodiments, the nest 956 and cannula 954 may be formed as asingle, unitary member.

The cannula 954 and nest 956 are initially supported on the needle 950in the start position, with the needle 950 extending through the hollowinterior of the cannula 954 and with the sharp end 950 a of the needle950 extending beyond one end of the cannula 954, as shown in FIG. 29.The cannula 954 and nest 956 move with the movement of the needle, fromthe initial start or retracted position of FIG. 29, to the extendedposition of FIG. 30. The nest 956 is provided with one or more lockingtabs 956 a for engaging and abutting one or more stop surfaces 958 onthe housing 944, when the cannula 954 and nest 956 reach the extendedposition of FIG. 30. The locking tab(s) 956 a may be suitably flexible,to flex enough to ride over the portion of the housing 944 adjacent thestop surface(s) 958 and then flex back into engagement with the stopsurface(s) 958. When the locking tab(s) 956 a lock into place againstthe stop surface(s) 958, the cannula 954 and the nest 956 are lockedinto an extended position, as shown in FIGS. 30 and 31. Once the cannula954 and nest 956 are locked into place, the needle 950 may be retractedback to the retracted position, while leaving the cannula 954 in theextended position, as shown in FIG. 31.

A pair of spring members 960 and 962 and lever members 964 and 966 areprovided to impart a force on the needle 950 and cannula 954, in theaxial dimension A₄, to move the needle 950 and cannula 954 from thestart position (shown in FIG. 29), in the direction of arrow 968, to theextended position (shown in FIG. 30).

As shown in FIG. 29, the lever 964 is connected to the needle 950,adjacent the needle end 950 b and is moveable with the needle 950,between the retracted or start position (of FIG. 29) to the extendedposition (of FIG. 30) and back to a retracted position (of FIG. 31). Thelever 964 extends through the slot 948 in the housing 944 and moveslinearly along the slot 948, as the needle 950 is moved between theretracted or start position (of FIG. 29) to the extended position (ofFIG. 30) and back to a retracted position (of FIG. 31).

The spring 960 is a spring wire that has a pair of ends (one end shownin FIG. 28) that are connected in a fixed relation to the housing 944.For example, each end of the spring 960 may be wrapped around a groovedprotrusion or ear 969 on the housing 944, and held in place by thenatural spring force of the spring 960. The spring 960 is configured tobe bent against its natural spring force, into the position shown inFIG. 28, wherein a portion 960 a of the spring 960 extends over thelever 964, but is urged in the direction of arrow 968 by the naturalspring force of the spring 960. The portion 960 a of the spring 960 isinitially held within a groove in the lever 966. The lever 966 issupported by the housing 944 for pivotal motion in the direction ofarrow 970.

Upon pivoting of the lever 966 in the direction of arrow 970 (forexample, by application of manual or mechanical force on the lever 966in the direction of arrow 970), the portion 960 a of the spring 960 isreleased from the lever and abuts the lever 964. Upon abutting the lever964, the spring 960 imparts a force on the lever 964 in the direction ofarrow 968, to move the needle 950 from the retracted or start positionof FIGS. 28 and 29 to the extended position of FIG. 30. Upon reachingthe extended position of FIG. 30, the continued motion or momentum ofthe spring 960 causes the tip of the lever 964 to break or bend away,freeing the spring 960 from the lever 964. Once the spring 960 is freedfrom the lever 964, the lever 964 (and the needle 950 connected to thelever 964) is moved back to the retracted position (as shown in FIG.31), under the force of the spring 962. In particular, the spring 962has a pair of ends that are connected in a fixed relation to the housing944, similar to the manner described above for spring 960. A centralportion 962 a of the spring 962 is arranged adjacent and in abutmentwith the lever 964, to move the lever 964 in the direction opposite toarrow 968, from the extended position of FIG. 30 to the retractedposition of FIG. 31.

The relative spring strengths of the springs 960 and 962 are selectedsuch that the spring force of the spring 960 (for moving the lever 964from the retracted or start position of FIG. 29 to the extended positionof FIG. 30) is sufficiently greater than the spring force of the spring962 (for moving the lever 964 from the extended position of FIG. 30 tothe retracted position of FIG. 31). Also, the material from which thelever 964 is made is selected to provide the break-away or bendingfeature, to allow the spring 960 to free itself from the lever 964, whenthe lever reaches the extended position of FIG. 30.

Accordingly, in operation, the needle 950, cannula 954, springs 960 and962 and levers 964 and 966 are arranged as shown in FIGS. 28 and 29, ina retracted or start position. To activate the device, a user maymanually (or mechanically) pivot the lever 966 to release the spring 960and cause the spring 960 to force the lever 964 toward the extendedposition. As the lever 964 moves toward the extended position, theneedle 950 and cannula 954 are also moved with the lever 964 to theextended position of FIG. 30. In the extended position, the cannula nest956 locks the cannula 954 in place in the extended position. Inaddition, the spring 960 frees itself from the lever 964 and allows thespring 962 to move the lever 964 back to the retracted position. As thelever 964 moves back to the retracted position, the needle 950 is alsomoved back to the retracted position, as shown in FIG. 31. In theretracted position, the needle 950 provides a hollow conduit, connectingthe conduit 952 in fluid-flow communication with the cannula 954.Accordingly, the cannula 954 may be placed in the extended position andin fluid-flow communication, through the conduit 952, with a reservoiror other fluid source.

By supporting the housing 944 at an injection site (either in thedisposable housing portion 20, the durable housing portion 22 or aninjection site module), the housing 944 may be arranged adjacent apatient-user's skin (for example, when the disposable housing portion20, the durable housing portion 22 or the injection site module isarranged adjacent the patient-user's skin, as described above), to allowthe sharp end of the needle 950 to pierce the patient-user's skin and toallow the cannula 954 to be inserted at least partially into thepatient-user's skin, when the needle is in the extended position of FIG.30.

In delivery device embodiments described above, a needle injector deviceis provided on a disposable housing portion (e.g., 20 in FIG. 3), wherethe disposable housing portion is provided with a base portion 21 thatmay be secured to the patient-user's skin by, for example, but notlimited to, an adhesive material provided on the bottom surface of thebase portion 21. That arrangement is generally represented, in sideview, in FIG. 32, wherein an adhesive material 101 is provided on thebottom surface (skin-facing surface) of the base 21 of the disposablehousing portion 20. As shown in FIGS. 2, 3 and 32, the durable housingportion 22 may be configured to be arranged on the base 21 of thedisposable housing portion 20 to engage and connect to the disposablehousing portion 22. In such an arrangement, the base 21 may be disposedbetween the durable housing portion 22 and the patient-user's skin,during operation, such that only the base 21 of the disposable housingportion remains in contact with the patient-user's skin, duringoperation.

However, in other embodiments, the durable housing portion 22 and thedisposable housing portion 20 may be configured to engage each other ina side-by-side arrangement, for example, as shown in FIG. 33. In theside-by-side arrangement in FIG. 33, either one or both of the durablehousing portion 22 and the disposable housing portion 20 may be providedwith an adhesive material 101 (and a peelable cover layer 23 as shown inFIG. 3).

Also, while embodiments described above may include an on-board needleor cannula injector device as described herein that may be activatedthrough the operator or opening 25, other embodiments may employ aninjection site module 103 that is external to the disposable housingportion 20, but connected to the disposable housing portion 20, througha suitable conduit 102, as shown in FIG. 34. The external injection sitemodule 103 may include a needle or cannula injector device structure andan operator or opening (similar to the operator or opening 25 describedabove) through which the injector device may be activated. Alternativelyor in addition, the external injection site module 103 may include aninfusion set such as, but not limited to an infusion set as described orreferenced in U.S. patent application Ser. No. 10/705,686, filed Nov.10, 2003, titled “Subcutaneous Infusion Set” (Publication No.2005/0101910) and/or U.S. patent application Ser. No. 11/004,594, filedDec. 3, 2004, titled “Multi-Position Infusion Set Device And Process”(Publication No. 2006/0129090), each of which is assigned to theassignee of the present invention and each of which is incorporatedherein by reference, in its entirety.

The conduit 102 that connects the module 103 with the disposable housingportion 20 may be any suitable tubing structure having a fluid flowpassage, such as, but not limited to, a flexible tube made of plastic,silicone or the like. An adhesive material may be provided on the tubingstructure (or between the tubing structure and the patient-user's skin)to secure the tubing to the patient-user's skin. By locating theinjection site module 103 external to the disposable housing portion 20,the disposable housing portion 20 and the durable housing portion 22 maybe clipped to a patient-user's clothing, belt, suspender or otherarticle of apparel or may be held in a pocket of an article of apparelor carried in a purse or the like.

In one embodiment, the conduit 102 may be fixed at one end to thedisposable housing portion 20, in fluid-flow communication with thereservoir within the disposable housing portion 20, and fixed at asecond end to an external injection site module 103, for connection influid-flow communication with a hollow needle or cannula, as describedabove. In further embodiments, one or both of the ends of the conduit102 may include suitable connection structures that allow the conduitends to be selectively connected in fluid-flow communication with, andselectively disconnected from the disposable housing portion 20 and/orthe injection site module 103. Such connectors may comprise a hollowneedle and septum, a Luer connector, or other suitablefluid-communication connectors. In such embodiments, the disposablehousing portion 20 and the durable housing portion 22 may bedisconnected from the module 103, for example, by disconnecting one ofthe ends of the conduit 102 from the module 103 or the disposablehousing portion 20, while leaving the module 103 in place (withoutrequiring the patient-user to withdraw the needle or cannula and, later,insert a needle or cannula to resume operation). In this manner, apatient-user may readily disconnect and remove the disposable housingportion 20 and durable housing portion 22, for example, to allow thepatient-user to shower, bath, swim or conduct other activities, yet alsoallow the patient-user to readily re-connect the disposable housingportion 20 to the module 103, for example, upon completion of suchactivities.

In yet further embodiments, the conduit 102 may be eliminated and aninjection site module 103 may be directly connected with the disposablehousing portion 20, as shown in FIG. 35. In such an embodiment, one ormore suitable fluid flow passages are provided through the disposablehousing portion 20 and into the injection site module 103, forfluid-flow communication between the reservoir in the disposable housingportion 20 and a hollow needle or cannula, as described above. Also, insuch embodiments, the injection site module 103 and the disposablehousing portion 20 may include mating connection structures to allow theinjection site module 103 and the disposable housing portion 20 to beselectively connected and disconnected from each other.

Various examples of mating arrangements, for directly connecting aninjection site module 103 to a disposable housing portion are describedwith reference to FIGS. 36-41. FIGS. 36 and 37 show an examplearrangement, in which an injection site module 103 includes at least one(two in FIG. 36) protruding engagement pawl 104 that are configured tobe received in a corresponding number of receptacles on the disposablehousing portion 20 (similar to the pawls 74 and receptacles 76 describedin U.S. Patent Application No. 60/839,741, titled INFUSION PUMPS ANDMETHODS AND DELIVERY DEVICES AND METHODS WITH SAME, filed Aug. 23, 2006,(attorney docket no. 047711-0385), which has been incorporated herein byreference. In other embodiments, the pawl(s) 104 may be located on thedisposable housing portion 20, while the corresponding receptacles maybe located on the module 103. In yet other embodiments, each of thedisposable housing portion 20 and the module 103 may include one or morepawls and one or more receptacles.

The pawls 104 and receptacles may be configured to allow a patient-userto manually slide the pawls into the receptacles as the disposablehousing portion 20 and the module 103 are brought together. When thepawls 104 are received in the corresponding receptacles, the module 103is secured to the disposable housing portion 20. The pawls 104 mayinclude a shaped portion or head to provide a snap-fit with thereceptacles, when the pawls 104 are fully received within thereceptacles. The pawls 104 may be configured with sufficient flexibilityto allow the patient-user to separate the disposable housing portion 20from the module 103, by applying a sufficient force to pull those twoparts away from each other and unsnap the pawls 104 from thereceptacles. In the embodiment of FIGS. 36 and 37, the module 103 may beattached to or may include a base portion 105 that may be secured to apatient-user's skin during operation, in lieu of the extended base 21 ofthe disposable housing portion 20 described above. The base portion 105may include an adhesive material and peelable cover layer as describedabove with respect to the base 21 of the disposable housing portion 20.

Another example of a connection structure is described with reference toFIGS. 38 and 39, wherein the module 103 includes a shaped head 106configured to be received within a correspondingly shaped opening orreceptacle in the disposable housing portion 20. The shaped head 106 maybe configured with a shape that allows the head to be received in thereceptacle when the disposable housing portion 20 is aligned relative tothe module 103 in a first alignment position, as shown in FIG. 37, andfurther allows the disposable housing portion 20 to be rotated relativeto the module 103 while the head 106 is received within the receptacleto a second alignment position as shown in FIG. 39. The receptacle inthe disposable housing portion 20 may be shaped to allow the head 106 tobe freely received or removed from the receptacle, when the disposablehousing portion 20 is in the first alignment position (FIG. 38), yetabut the head 106 and inhibit separation of the head 106 from thereceptacle (and, thus, inhibit separation of the disposable housingportion 20 from the module 103), when the disposable housing portion isin the second alignment position (FIG. 39).

A further example of a connection structure is described with referenceto FIGS. 40 and 41, wherein the module 103 includes a shaped receptacle107 configured to receive a correspondingly shaped connector member inthe disposable housing portion 20. The shaped receptacle 107 may beconfigured with a shape that allows the connector member of thedisposable housing portion to be engaged with the receptacle 107 whenthe disposable housing portion 20 is aligned relative to the module 103in a first alignment position, as shown in FIG. 40, and further allowsthe disposable housing portion 20 to be rotated relative to the module103, while the receptacle 107 is engaged within the connector member, toa second alignment position as shown in FIG. 41. The receptacle 107 andthe connector member in the disposable housing portion 20 may be shapedto allow the connector member to be freely engage the receptacle 454,when the disposable housing portion 20 is in the first alignmentposition (FIG. 40), yet lock with the receptacle 107 and inhibitseparation of the connector member from the receptacle (and, thus,inhibit separation of the disposable housing portion 20 from the module103), when the disposable housing portion is in the second alignmentposition (FIG. 41). The receptacle 107 and connection member may includeany suitable known rotary connection structures for connecting twostructures together upon engagement and relative rotation of the twostructures in one direction, yet allow the two structures to bedisengaged and separated from an engaged arrangement, by relativerotation of the two structures in the second, opposite direction.

In yet further embodiments, the injection site module may be formed as aunitary structure with the disposable housing portion 20. Also, in anyof the embodiments described above, one or more sensors may be locatedin the disposable housing portion 20, the injection site module 103 orthe durable housing portion 22, for sensing a biological condition,including, but not limited to, blood glucose level, level of infusionmedium in the patient-user's blood and/or other conditions. Suchsensor(s) may include a hollow needle or cannula and/or a set ofmicro-needles, as described above, for piercing the patient-user's skinto convey fluid from the patient to the sensor.

Also, various embodiments described above may employ a reservoir 28that, in some examples, may include a canister that is removable fromand insertable into the first or disposable housing portion 20. In thismanner, a reservoir cartridge may be removed and replaced with a new,refilled, pre-filled, user-filled, refurbished or remanufacturedcartridge. In such embodiments, the reservoir cartridge may include anelectronic storage device (such as an electronic memory chip or thelike) for storing information, such as, but not limited to,identification of the contents of the reservoir, identification of themaker of the reservoir or its contents, information relating to thestate of fill or depletion of the reservoir, or the like. Suitableelectrical contact pads located in the disposable housing portion mayelectrically connect with contact pads on the reservoir, to electricallyconnect the electronic storage device on the reservoir canister withsuitable electronics in the disposable housing portion or the durablehousing portion 22, for reading information stored on the electronicstorage device. Such information (or other information, warnings, etc.,associated with the stored information) may be displayed on a displaydevice on the durable housing portion 22, when the reservoir canister isinserted into the disposable housing portion 20, and the disposablehousing portion 20 and the durable housing portion 22 are engaged.

In addition, in any of the above-described embodiments, one or both ofthe disposable housing portion 20 and the durable housing portion 22(and/or a separate base portion 105 or a separate injection site module103) may include a force sensor (not shown) or other suitable sensingdevice for sensing the proper placement or engagement of one or more ofthe disposable housing portion 20 and the durable housing portion 22(and/or a separate base portion or a separate injection site module) ona patient-user's skin (or other proper location for operation with thepatient). In such an embodiment, further electronics may control theoperation of the drive device to inhibit operation of the drive deviceand/or the needle injector, unless the sensor senses the proper operableengagement of one or more of the disposable housing portion 20 and thedurable housing portion 22 (and/or a separate base portion or a separateinjection site module) with the patient-user's skin (or other properlocation for operation).

Alternatively or in addition, one or both of the disposable housingportion 20 and the durable housing portion 22 may include a sensingdevice (not shown) for sensing the proper operable engagement of thedisposable housing portion 20 and the durable housing portion 22together (and/or with a separate base portion or a separate injectionsite module). In such an embodiment, further electronics may control theoperation of the drive device to inhibit operation of the drive deviceand/or the needle injector, unless the sensor senses the proper operableengagement of the disposable housing portion 20 and the durable housingportion 22 together (and/or with a separate base portion or a separateinjection site module).

In any of the above embodiments, a sensor may be provided in (orotherwise associated with) the reservoir to detect a low volume ofinfusion medium in the reservoir. For example, a sensor may beconfigured to detect a condition at which the volume of infusion mediumin the reservoir reaches a threshold minimal level. A warning device maybe operably connected to the sensor, to provide a warning signal, uponthe detection of a low volume condition. The warning device may providean audible warning sound, a visible warning signal and/or a tactilewarning signal (such as, but not limited to a perceptible vibration) tothe patient-user, upon the detection of the volume of infusion medium inthe reservoir reaching a threshold minimal level. In one embodiment, thevisible warning may be provided as a message on an electronic display(as described above) on the durable housing portion 22. Alternatively orin addition, a warning signal condition may be communicated to anddisplayed on a remote CCD 16 or computer 18 (FIG. 2), for example,through wireless communication electronics as described above.

In addition, while various embodiments described above may include oneor more adhesive layers, each having a peelable cover layer, otherembodiments may employ a single adhesive layer having (or pluraladhesive layers, each having) a pattern of plural peelable cover layerportions, such that a patient-user may peel off one portion of the coverlayer for adhering the delivery device to the patient-user as describedabove, while leaving the rest of the pattern of peelable cover layerportions on the adhesive. In such an embodiment, after completion of afirst period of operation of the delivery device and removal of thedelivery device from the patient-user, a second portion of the peelablecover layer may be removed from the adhesive layer and the deliverydevice may be adhered to a patient-user for a second period ofoperation.

Also, while various delivery device embodiments described above includebase portions (for example, 105) that are configured to be secured to apatient-user's skin (or other suitable surface of operation) and thatextend along the full length and width of the delivery device structure,other embodiments may employ base portions (that secure to thepatient-user's skin or other surface) that are configured to be lessthan the full length or width dimension of the delivery devicestructure, to minimize the surface area in contact with the patient-user(or other surface) and, thus, improve patient-user comfort duringoperation. Base portions having shapes and sizes different from thoseshown in the accompanying drawings may be employed for additionalimprovements with regard to patient-user comfort and minimizing surfacearea in contact with the patient-user. Furthermore, as noted above, thebase portion may be composed of a flexible material that at leastpartially conforms to the curvature and movement of the patient-user'sbody.

In any of the above-described embodiments in which an adhesive materialis used to secure one or more of the delivery device components to thepatient-user's skin (or other suitable surface for operation), multipletypes of adhesive materials (or multiple strengths of adhesives) may beemployed, such that a stronger adhesive is provided in certain areas(such as around the needle injection site), while a weaker adhesive isprovided in other areas.

In any of the above-described embodiments, a priming process may becarried out, prior to activation of the needle inserter, to convey fluidfrom the reservoir 28 to the hollow needle or cannula and/or fill thefluid flow path between the reservoir 28 and the hollow needle orcannula. In some embodiments, priming may be carried out before thedelivery device (or component of the delivery device that contains theneedle inserter) is secured to the patient user's skin. Priming mayinclude running the drive device of the delivery device for a period oftime, for example, but not limited to, a period of time until the userobserves fluid at the tip of the hollow needle or cannula. In furtherembodiments, as represented by FIG. 42, a stop-member 980 may beprovided, temporarily, at the tip of the hollow needle 982 (shown inFIG. 42 with a cannula 984 supported thereon) to allow passage of airout of the needle or cannula, but also provide a back pressure againstflow of infusion medium fluid from the needle, for priming. The stopmember may be made of or lined with a hydrophobic material, such as, butnot limited to a hydrophobic membrane provided under the name GORE-TEXT™(a trademark of W.L. Gore & Associates, Inc.) or other suitablehydrophobic material. In further embodiments, the stop member mayinclude a further material that changes color (or other perceptiblecharacteristic) when in contact with an infusion medium, to provide avisual indication that priming is completed.

In yet other embodiments of using a hydrophobic material during priming,a needle inserter set may include a removable needle hub that ispositioned within a hollow cannula when the cannula is inserted into thepatient-user's skin and removed, leaving the cannula in place, afterinsertion of the cannula, such as, but not limited to a needle setconfiguration as described in U.S. Pat. No. 4,755,173, which isincorporated herein by reference in its entirety, and/or as employed inproducts produced by Medtronic, Inc., under the product name Paradigm™quick-set™ and Paradigm™ sof-set™, each of which is a trademark ofMedtronic-MiniMed, Inc. or Medtronic, Inc. With reference to FIG. 43, insuch embodiments, the hollow needle 982 of the needle hub 986 mayinclude a hydrophobic material 988 at its tip, for providing a backpressure against fluid flow of liquid infusion medium, but allow air toescape from the hollow needle during priming. In such an embodiment, theinterior surface of the hollow needle 982 may include a coating or layerof hydrophobic material 988 at or near its piercing end, as shown inFIG. 43. Alternatively, or in addition, a plug of hydrophobic materialmay be placed in the hollow needle 982, for example, at or adjacent thepiercing end of the needle. Alternatively, or in addition, a stop member980 as described above may be employed during priming, for enhancingback pressure against fluid flow of liquid infusion medium, whileallowing air to escape from the hollow needle.

In such an embodiment, prior to insertion of the needle and cannula intoa patient-user, the hollow needle extends through the cannula and isvisible adjacent one end of the cannula. The drive device of thedelivery device may be operated to drive fluid from the reservoir 28 tothe hollow needle and cannula. The hydrophobic material at the tip ofthe hollow needle allows passage of air, but inhibits the infusionmedium fluid from passing through the hollow needle. Upon running of thedrive device for a defined period of time and/or until a completion ofpriming is detected, the needle and cannula may be inserted into thepatient-user. After insertion of the needle and cannula, the needle maybe removed from the cannula by withdrawing the needle hub from theremainder of the needle inserter set, leaving the cannula in placewithin the patient-user's skin and in fluid-flow connection with thereservoir.

Various aspects of the multiple embodiments described above may beemployed independently or in combinations thereof. While particularembodiments of the present invention have been shown and described, itwill be obvious to those skilled in the art that the invention is notlimited to the particular embodiments shown and described and thatchanges and modifications may be made without departing from the spiritand scope of the claimed invention. For example, while embodiments aredescribed above in the context of delivery devices for delivering aninfusion medium from a reservoir to a patient-user, other embodimentsmay be operated to withdraw a fluidic medium from a patient-user (orother source) and transfer the fluidic medium to the reservoir. Suchother embodiments may be operated by operating the drive device toincrease the fluid-retaining volume of the reservoir and create anegative pressure sufficient to draw fluid from the patient-user (orother source) to which the hollow needle or cannula is secured.

1. A needle injector device for connection in fluid-flow communicationwith the inlet or outlet port of a reservoir, the needle injectorcomprising: a base structure for arranging adjacent a user's skin; atleast one pivotal arm supported for pivotal motion relative to the base,between a first pivot position and a second pivot position; a moveableneedle supported by the base structure for movement between a retractedposition and an extended position, the moveable needle having a head anda shaft, the needle shaft having a piercing end for piercing the user'sskin when the base structure is arranged adjacent the user's skin andthe moveable needle is moved to the extended position, wherein theneedle shaft has a sufficient length to extend through a hollow cannulato extend the piercing end of the needle out one end of the cannula andsupport the cannula on the needle for movement with the needle betweenthe retracted position and the extended position; a first springsupported by the base portion and arranged to provide a first bias forceon the needle head at least when the needle is in the extended position,the first bias force directed to bias the needle toward the retractedposition; a second spring supported by the base portion and arranged tobe held in a compressed state by the at least one pivotal arm, when theat least one pivotal arm is in the first pivot position and, from thatstate, to be released to expand toward its natural state ofuncompression upon the at least one pivotal arm moving to the secondpivot position; wherein, when (i) the base structure is arrangedadjacent the user's skin, (ii) the moveable needle and cannula are inthe extended position and (iii) the second spring is released from itscompressed state and expands toward its natural state of uncompression,a second bias force is provided on the needle head by the second springto move the needle from an extended position to a retracted position,while leaving the cannula in the user's skin.
 2. A device according toclaim 1, wherein the base structure has an opening through which theneedle moves as the needle is moved between the retracted and extendedpositions.
 3. A device according to claim 2, wherein the first andsecond springs comprise first and second coil springs, respectively, andwherein the first and second coil springs are arranged with their coilsaround the opening in the base structure.
 4. A device according to claim1, wherein the first and second springs comprise first and secondcoaxially arranged coil springs, respectively, and wherein the needle issupported for movement within the first and second coil springs.
 5. Adevice according to claim 4, wherein the needle is arranged to extendalong the common axis of the first and second coil springs.
 6. A deviceaccording to claim 1, further comprising a flange member arranged toabut the at least one pivotal arm, needle head and the second springwhen (i) the at least one pivotal arm is in the first pivot position,(ii) the second spring is in its compressed state, and (iii) the needleis in the extended position, and to move with the needle head toward theretracted position of the needle when the at least one pivotal arm ismoved to the second pivot position to release the second spring.
 7. Aneedle injector device for connection in fluid-flow communication withthe inlet or outlet port of a reservoir, the needle injector comprising:a base structure for arranging adjacent a user's skin; at least onemoveable locking member supported for motion relative to the base,between at least one first position and at least one second position; amoveable needle supported by the base structure for movement between aretracted position and an extended position, the moveable needle havinga head and a shaft, the needle shaft having a piercing end for piercingthe user's skin when the base structure is arranged adjacent the user'sskin and the moveable needle is moved to the extended position, a firstbias member arranged to provide a first bias force on the needle head atleast when the needle is in the extended position, the first bias forcedirected to bias the needle toward the retracted position; a second biasmember arranged to be held by the at least one moveable locking memberin a state at which the second bias member stores a bias energy when theat least one moveable locking member is in one of the first positionsand, from that state, to a state at which the stored bias energy isreleased to apply a force on the needle head to move the needle towardthe retracted position, when the at least one moveable locking member ismoved to one of the second positions.
 8. A device according to claim 7,wherein the needle shaft has a sufficient length and width relative to ahollow cannula to extend through the hollow cannula and to extend thepiercing end of the needle out one end of the cannula, while supportingthe cannula on the needle for movement with the needle between theretracted position and the extended position, and to leave the cannulain the extended position in a user's skin, when (i) the base structureis arranged adjacent the user's skin, (ii) the moveable needle andcannula are in the extended position and (iii) the second bias member isreleased from its bias energy storing state and moves the needle fromits extended position toward its retracted position.
 9. A deviceaccording to claim 7, wherein the at least one moveable locking membercomprises at least one pivotal arm.
 10. A device according to claim 7,wherein the at least one moveable locking member comprises a pluralityof pivotal arms.
 11. A device according to claim 7, wherein the firstbias member comprises a spring.
 12. A device according to claim 11,wherein the second bias member comprises a spring.
 13. A deviceaccording to claim 7, wherein the first and second bias members comprisefirst and second coil springs, respectively.
 14. A device according toclaim 7, wherein the first and second bias members comprises first andsecond coaxially arranged coil springs, respectively.
 15. A deviceaccording to claim 7, wherein the first and second bias members aresupported by the base structure.
 16. A device according to claim 7,wherein the first and second bias members are supported by the basestructure and the first and second bias members comprises first andsecond coaxially arranged coil springs, respectively, and wherein theneedle is supported for movement within the first and second coilsprings.
 17. A device according to claim 16, wherein the needle isarranged to extend along the common axis of the first and second coilsprings.
 18. A delivery device for delivering an infusion medium to auser, the delivery device comprising: a housing structure, the housingstructure having an injection site portion; a reservoir supported by thehousing structure, the reservoir having an interior for containing aninfusion medium, a needle injector supported by the injection siteportion of the housing structure and connected in fluid flowcommunication with the interior of the reservoir, the needle injectorcomprising: a base structure for arranging adjacent a user's skin; atleast one moveable locking member supported for motion relative to thebase, between at least one first position and at least one secondposition; a moveable needle supported by the base structure for movementbetween a retracted position and an extended position, the moveableneedle having a head and a shaft, the needle shaft having a piercing endfor piercing the user's skin when the base structure is arrangedadjacent the user's skin and the moveable needle is moved to theextended position, a first bias member arranged to provide a first biasforce on the needle head at least when the needle is in the extendedposition, the first bias force directed to bias the needle toward theretracted position; a second bias member arranged to be held by the atleast one moveable locking member in a state at which the second biasmember stores a bias energy when the at least one moveable lockingmember is in one of the first positions and, from that state, to a stateat which the stored bias energy is released to apply a force on theneedle head to move the needle toward the retracted position, when theat least one moveable locking member is moved to one of the secondpositions.
 19. A device according to claim 18, wherein the needle shafthas a sufficient length and width relative to a hollow cannula to extendthrough the hollow cannula and to extend the piercing end of the needleout one end of the cannula, while supporting the cannula on the needlefor movement with the needle between the retracted position and theextended position, and to leave the cannula in the extended position ina user's skin, when (i) the base structure is arranged adjacent theuser's skin, (ii) the moveable needle and cannula are in the extendedposition and (iii) the second bias member is released from its biasenergy storing state and moves the needle from its extended positiontoward its retracted position.
 20. A device according to claim 18,wherein the at least one moveable locking member comprises at least onepivotal arm.
 21. A device according to claim 18, wherein the first andsecond bias members comprise first and second coil springs,respectively.
 22. A device according to claim 21, wherein the first andsecond coil springs are arranged coaxially on the base structure.